diff --git a/deluge/tests/test_files_tab.py b/deluge/tests/test_files_tab.py
index 8e522aa1d..a205fb218 100644
--- a/deluge/tests/test_files_tab.py
+++ b/deluge/tests/test_files_tab.py
@@ -37,7 +37,7 @@ class FilesTabTestCase(BaseTestCase):
             raise unittest.SkipTest('GTKUI dependencies not available')
 
         common.set_tmp_config_dir()
-        ConfigManager('gtkui.conf', defaults=DEFAULT_PREFS)
+        ConfigManager('gtk3ui.conf', defaults=DEFAULT_PREFS)
         self.mainwindow = MainWindow()
         self.filestab = FilesTab()
         self.t_id = '1'
diff --git a/deluge/tests/test_torrentview.py b/deluge/tests/test_torrentview.py
index 6ff95c8f6..dc7dd1350 100644
--- a/deluge/tests/test_torrentview.py
+++ b/deluge/tests/test_torrentview.py
@@ -111,7 +111,7 @@ class TorrentviewTestCase(BaseTestCase):
 
         common.set_tmp_config_dir()
         # MainWindow loads this config file, so lets make sure it contains the defaults
-        ConfigManager('gtkui.conf', defaults=DEFAULT_PREFS)
+        ConfigManager('gtk3ui.conf', defaults=DEFAULT_PREFS)
         self.mainwindow = MainWindow()
         self.torrentview = TorrentView()
         self.torrentdetails = TorrentDetails()
diff --git a/deluge/ui/gtkui/__init__.py b/deluge/ui/gtk3/__init__.py
similarity index 97%
rename from deluge/ui/gtkui/__init__.py
rename to deluge/ui/gtk3/__init__.py
index c57c468f0..3b9d2b123 100644
--- a/deluge/ui/gtkui/__init__.py
+++ b/deluge/ui/gtk3/__init__.py
@@ -40,7 +40,7 @@ class Gtk(UI):
 
     def start(self):
         super(Gtk, self).start()
-        from deluge.ui.gtkui.gtkui import GtkUI
+        from .gtkui import GtkUI
         import deluge.common
 
         def run(options):
diff --git a/deluge/ui/gtkui/aboutdialog.py b/deluge/ui/gtk3/aboutdialog.py
similarity index 99%
rename from deluge/ui/gtkui/aboutdialog.py
rename to deluge/ui/gtk3/aboutdialog.py
index cb3ed43c8..a7dff4948 100644
--- a/deluge/ui/gtkui/aboutdialog.py
+++ b/deluge/ui/gtk3/aboutdialog.py
@@ -14,7 +14,8 @@ from gi.repository import Gtk
 import deluge.component as component
 from deluge.common import get_version, open_url_in_browser, windows_check
 from deluge.ui.client import client
-from deluge.ui.gtkui.common import get_deluge_icon, get_pixbuf
+
+from .common import get_deluge_icon, get_pixbuf
 
 
 class AboutDialog(object):
diff --git a/deluge/ui/gtkui/addtorrentdialog.py b/deluge/ui/gtk3/addtorrentdialog.py
similarity index 98%
rename from deluge/ui/gtkui/addtorrentdialog.py
rename to deluge/ui/gtk3/addtorrentdialog.py
index 7c6843ffa..6c5f81a55 100644
--- a/deluge/ui/gtkui/addtorrentdialog.py
+++ b/deluge/ui/gtk3/addtorrentdialog.py
@@ -24,15 +24,12 @@ from deluge.configmanager import ConfigManager
 from deluge.httpdownloader import download_file
 from deluge.ui.client import client
 from deluge.ui.common import TorrentInfo
-from deluge.ui.gtkui.common import (
-    get_clipboard_text,
-    listview_replace_treestore,
-    reparent_iter,
-)
-from deluge.ui.gtkui.dialogs import ErrorDialog
-from deluge.ui.gtkui.edittrackersdialog import trackers_tiers_from_text
-from deluge.ui.gtkui.path_chooser import PathChooser
-from deluge.ui.gtkui.torrentview_data_funcs import cell_data_size
+
+from .common import get_clipboard_text, listview_replace_treestore, reparent_iter
+from .dialogs import ErrorDialog
+from .edittrackersdialog import trackers_tiers_from_text
+from .path_chooser import PathChooser
+from .torrentview_data_funcs import cell_data_size
 
 log = logging.getLogger(__name__)
 
@@ -44,20 +41,19 @@ class AddTorrentDialog(component.Component):
         # The base dialog
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'add_torrent_dialog.ui')
+                __package__, os.path.join('glade', 'add_torrent_dialog.ui')
             )
         )
         # The infohash dialog
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui',
-                os.path.join('glade', 'add_torrent_dialog.infohash.ui'),
+                __package__, os.path.join('glade', 'add_torrent_dialog.infohash.ui')
             )
         )
         # The url dialog
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'add_torrent_dialog.url.ui')
+                __package__, os.path.join('glade', 'add_torrent_dialog.url.ui')
             )
         )
 
@@ -679,7 +675,7 @@ class AddTorrentDialog(component.Component):
         chooser.add_filter(file_filter)
 
         # Load the 'default_load_path' from the config
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         if self.config['default_load_path'] is not None:
             chooser.set_current_folder(self.config['default_load_path'])
 
diff --git a/deluge/ui/gtkui/common.py b/deluge/ui/gtk3/common.py
similarity index 97%
rename from deluge/ui/gtkui/common.py
rename to deluge/ui/gtk3/common.py
index 57e309c80..2fd8fde83 100644
--- a/deluge/ui/gtkui/common.py
+++ b/deluge/ui/gtk3/common.py
@@ -284,7 +284,7 @@ def save_pickled_state_file(filename, state):
     """
     from deluge.configmanager import get_config_dir
 
-    filepath = os.path.join(get_config_dir(), 'gtkui_state', filename)
+    filepath = os.path.join(get_config_dir(), 'gtk3ui_state', filename)
     filepath_bak = filepath + '.bak'
     filepath_tmp = filepath + '.tmp'
 
@@ -321,11 +321,10 @@ def load_pickled_state_file(filename):
     """
     from deluge.configmanager import get_config_dir
 
-    filepath = os.path.join(get_config_dir(), 'gtkui_state', filename)
+    filepath = os.path.join(get_config_dir(), 'gtk3ui_state', filename)
     filepath_bak = filepath + '.bak'
-    old_data_filepath = os.path.join(get_config_dir(), filename)
 
-    for _filepath in (filepath, filepath_bak, old_data_filepath):
+    for _filepath in (filepath, filepath_bak):
         log.info('Opening %s for load: %s', filename, _filepath)
         try:
             with open(_filepath, 'rb') as _file:
diff --git a/deluge/ui/gtkui/connectionmanager.py b/deluge/ui/gtk3/connectionmanager.py
similarity index 98%
rename from deluge/ui/gtkui/connectionmanager.py
rename to deluge/ui/gtk3/connectionmanager.py
index 915c9046b..614758b09 100644
--- a/deluge/ui/gtkui/connectionmanager.py
+++ b/deluge/ui/gtk3/connectionmanager.py
@@ -21,10 +21,11 @@ from deluge.common import resource_filename, windows_check
 from deluge.configmanager import ConfigManager, get_config_dir
 from deluge.error import AuthenticationRequired, BadLoginError, IncompatibleClient
 from deluge.ui.client import Client, client
-from deluge.ui.gtkui.common import get_clipboard_text
-from deluge.ui.gtkui.dialogs import AuthenticationDialog, ErrorDialog
 from deluge.ui.hostlist import DEFAULT_PORT, LOCALHOST, HostList
 
+from .common import get_clipboard_text
+from .dialogs import AuthenticationDialog, ErrorDialog
+
 try:
     from urllib.parse import urlparse
 except ImportError:
@@ -68,7 +69,7 @@ def cell_render_status(column, cell, model, row, data):
 class ConnectionManager(component.Component):
     def __init__(self):
         component.Component.__init__(self, 'ConnectionManager')
-        self.gtkui_config = ConfigManager('gtkui.conf')
+        self.gtkui_config = ConfigManager('gtk3ui.conf')
         self.hostlist = HostList()
         self.running = False
 
@@ -90,7 +91,7 @@ class ConnectionManager(component.Component):
         self.builder = Gtk.Builder()
         self.builder.add_from_file(
             resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'connection_manager.ui')
+                __package__, os.path.join('glade', 'connection_manager.ui')
             )
         )
         self.connection_manager = self.builder.get_object('connection_manager')
@@ -387,8 +388,7 @@ class ConnectionManager(component.Component):
         """
         self.builder.add_from_file(
             resource_filename(
-                'deluge.ui.gtkui',
-                os.path.join('glade', 'connection_manager.addhost.ui'),
+                __package__, os.path.join('glade', 'connection_manager.addhost.ui')
             )
         )
         dialog = self.builder.get_object('addhost_dialog')
diff --git a/deluge/ui/gtkui/createtorrentdialog.py b/deluge/ui/gtk3/createtorrentdialog.py
similarity index 93%
rename from deluge/ui/gtkui/createtorrentdialog.py
rename to deluge/ui/gtk3/createtorrentdialog.py
index 224bea0ef..e9339634b 100644
--- a/deluge/ui/gtkui/createtorrentdialog.py
+++ b/deluge/ui/gtk3/createtorrentdialog.py
@@ -21,11 +21,12 @@ import deluge.component as component
 from deluge.common import get_path_size, is_url, resource_filename
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui.edittrackersdialog import (
+
+from .edittrackersdialog import (
     last_tier_trackers_from_liststore,
     trackers_tiers_from_text,
 )
-from deluge.ui.gtkui.torrentview_data_funcs import cell_data_size
+from .torrentview_data_funcs import cell_data_size
 
 log = logging.getLogger(__name__)
 
@@ -37,35 +38,18 @@ class CreateTorrentDialog(object):
     def show(self):
         self.builder = Gtk.Builder()
 
-        # The main dialog
-        self.builder.add_from_file(
-            resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'create_torrent_dialog.ui')
+        ui_filenames = [
+            'create_torrent_dialog.ui',
+            'create_torrent_dialog.remote_path.ui',
+            'create_torrent_dialog.remote_save.ui',
+            'create_torrent_dialog.progress.ui',
+        ]
+        for filename in ui_filenames:
+            self.builder.add_from_file(
+                resource_filename(__package__, os.path.join('glade', filename))
             )
-        )
-        # The remote path dialog
-        self.builder.add_from_file(
-            resource_filename(
-                'deluge.ui.gtkui',
-                os.path.join('glade', 'create_torrent_dialog.remote_path.ui'),
-            )
-        )
-        # The remote save dialog
-        self.builder.add_from_file(
-            resource_filename(
-                'deluge.ui.gtkui',
-                os.path.join('glade', 'create_torrent_dialog.remote_save.ui'),
-            )
-        )
-        # The progress dialog
-        self.builder.add_from_file(
-            resource_filename(
-                'deluge.ui.gtkui',
-                os.path.join('glade', 'create_torrent_dialog.progress.ui'),
-            )
-        )
 
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
 
         self.dialog = self.builder.get_object('create_torrent_dialog')
         self.dialog.set_transient_for(component.get('MainWindow').window)
@@ -478,7 +462,7 @@ class CreateTorrentDialog(object):
         builder = Gtk.Builder()
         builder.add_from_file(
             resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'edit_trackers.add.ui')
+                __package__, os.path.join('glade', 'edit_trackers.add.ui')
             )
         )
         dialog = builder.get_object('add_tracker_dialog')
diff --git a/deluge/ui/gtkui/details_tab.py b/deluge/ui/gtk3/details_tab.py
similarity index 95%
rename from deluge/ui/gtkui/details_tab.py
rename to deluge/ui/gtk3/details_tab.py
index 06f9e944d..98a60ceb5 100644
--- a/deluge/ui/gtkui/details_tab.py
+++ b/deluge/ui/gtk3/details_tab.py
@@ -14,8 +14,9 @@ from xml.sax.saxutils import escape as xml_escape
 
 import deluge.component as component
 from deluge.common import fdate, fsize, is_url
-from deluge.ui.gtkui.tab_data_funcs import fdate_or_dash, fpieces_num_size
-from deluge.ui.gtkui.torrentdetails import Tab
+
+from .tab_data_funcs import fdate_or_dash, fpieces_num_size
+from .torrentdetails import Tab
 
 log = logging.getLogger(__name__)
 
diff --git a/deluge/ui/gtkui/dialogs.py b/deluge/ui/gtk3/dialogs.py
similarity index 99%
rename from deluge/ui/gtkui/dialogs.py
rename to deluge/ui/gtk3/dialogs.py
index 36015486e..f310ce53a 100644
--- a/deluge/ui/gtkui/dialogs.py
+++ b/deluge/ui/gtk3/dialogs.py
@@ -16,7 +16,8 @@ from twisted.internet import defer
 
 import deluge.component as component
 from deluge.common import windows_check
-from deluge.ui.gtkui.common import get_deluge_icon, get_pixbuf_at_size
+
+from .common import get_deluge_icon, get_pixbuf_at_size
 
 
 class BaseDialog(Gtk.Dialog):
diff --git a/deluge/ui/gtkui/edittrackersdialog.py b/deluge/ui/gtk3/edittrackersdialog.py
similarity index 96%
rename from deluge/ui/gtkui/edittrackersdialog.py
rename to deluge/ui/gtk3/edittrackersdialog.py
index 2a4bb7494..8ea2c726d 100644
--- a/deluge/ui/gtkui/edittrackersdialog.py
+++ b/deluge/ui/gtk3/edittrackersdialog.py
@@ -19,7 +19,8 @@ import deluge.component as component
 from deluge.common import is_url, resource_filename
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui.common import get_deluge_icon
+
+from .common import get_deluge_icon
 
 log = logging.getLogger(__name__)
 
@@ -80,24 +81,22 @@ class EditTrackersDialog(object):
     def __init__(self, torrent_id, parent=None):
         self.torrent_id = torrent_id
         self.builder = Gtk.Builder()
-        self.gtkui_config = ConfigManager('gtkui.conf')
+        self.gtkui_config = ConfigManager('gtk3ui.conf')
 
         # Main dialog
         self.builder.add_from_file(
-            resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'edit_trackers.ui')
-            )
+            resource_filename(__package__, os.path.join('glade', 'edit_trackers.ui'))
         )
         # add tracker dialog
         self.builder.add_from_file(
             resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'edit_trackers.add.ui')
+                __package__, os.path.join('glade', 'edit_trackers.add.ui')
             )
         )
         # edit tracker dialog
         self.builder.add_from_file(
             resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'edit_trackers.edit.ui')
+                __package__, os.path.join('glade', 'edit_trackers.edit.ui')
             )
         )
 
diff --git a/deluge/ui/gtkui/files_tab.py b/deluge/ui/gtk3/files_tab.py
similarity index 99%
rename from deluge/ui/gtkui/files_tab.py
rename to deluge/ui/gtk3/files_tab.py
index fb8e347bf..c5db59061 100644
--- a/deluge/ui/gtkui/files_tab.py
+++ b/deluge/ui/gtk3/files_tab.py
@@ -21,14 +21,15 @@ import deluge.component as component
 from deluge.common import open_file, show_file
 from deluge.ui.client import client
 from deluge.ui.common import FILE_PRIORITY
-from deluge.ui.gtkui.common import (
+
+from .common import (
     listview_replace_treestore,
     load_pickled_state_file,
     reparent_iter,
     save_pickled_state_file,
 )
-from deluge.ui.gtkui.torrentdetails import Tab
-from deluge.ui.gtkui.torrentview_data_funcs import cell_data_size
+from .torrentdetails import Tab
+from .torrentview_data_funcs import cell_data_size
 
 log = logging.getLogger(__name__)
 
diff --git a/deluge/ui/gtkui/filtertreeview.py b/deluge/ui/gtk3/filtertreeview.py
similarity index 98%
rename from deluge/ui/gtkui/filtertreeview.py
rename to deluge/ui/gtk3/filtertreeview.py
index d761a22d5..dbbdd2c15 100644
--- a/deluge/ui/gtkui/filtertreeview.py
+++ b/deluge/ui/gtk3/filtertreeview.py
@@ -23,7 +23,8 @@ import deluge.component as component
 from deluge.common import TORRENT_STATE, resource_filename
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui.common import get_pixbuf, get_pixbuf_at_size
+
+from .common import get_pixbuf, get_pixbuf_at_size
 
 log = logging.getLogger(__name__)
 
@@ -48,7 +49,7 @@ FILTER_COLUMN = 5
 class FilterTreeView(component.Component):
     def __init__(self):
         component.Component.__init__(self, 'FilterTreeView', interval=2)
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
 
         self.tracker_icons = component.get('TrackerIcons')
 
@@ -107,9 +108,7 @@ class FilterTreeView(component.Component):
         # filtertree menu
         builder = Gtk.Builder()
         builder.add_from_file(
-            resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'filtertree_menu.ui')
-            )
+            resource_filename(__package__, os.path.join('glade', 'filtertree_menu.ui'))
         )
         self.menu = builder.get_object('filtertree_menu')
         builder.connect_signals(self)
diff --git a/deluge/ui/gtkui/glade/add_torrent_dialog.infohash.ui b/deluge/ui/gtk3/glade/add_torrent_dialog.infohash.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/add_torrent_dialog.infohash.ui
rename to deluge/ui/gtk3/glade/add_torrent_dialog.infohash.ui
diff --git a/deluge/ui/gtkui/glade/add_torrent_dialog.ui b/deluge/ui/gtk3/glade/add_torrent_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/add_torrent_dialog.ui
rename to deluge/ui/gtk3/glade/add_torrent_dialog.ui
diff --git a/deluge/ui/gtkui/glade/add_torrent_dialog.url.ui b/deluge/ui/gtk3/glade/add_torrent_dialog.url.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/add_torrent_dialog.url.ui
rename to deluge/ui/gtk3/glade/add_torrent_dialog.url.ui
diff --git a/deluge/ui/gtkui/glade/connect_peer_dialog.ui b/deluge/ui/gtk3/glade/connect_peer_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/connect_peer_dialog.ui
rename to deluge/ui/gtk3/glade/connect_peer_dialog.ui
diff --git a/deluge/ui/gtkui/glade/connection_manager.addhost.ui b/deluge/ui/gtk3/glade/connection_manager.addhost.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/connection_manager.addhost.ui
rename to deluge/ui/gtk3/glade/connection_manager.addhost.ui
diff --git a/deluge/ui/gtkui/glade/connection_manager.ui b/deluge/ui/gtk3/glade/connection_manager.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/connection_manager.ui
rename to deluge/ui/gtk3/glade/connection_manager.ui
diff --git a/deluge/ui/gtkui/glade/create_torrent_dialog.progress.ui b/deluge/ui/gtk3/glade/create_torrent_dialog.progress.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/create_torrent_dialog.progress.ui
rename to deluge/ui/gtk3/glade/create_torrent_dialog.progress.ui
diff --git a/deluge/ui/gtkui/glade/create_torrent_dialog.remote_path.ui b/deluge/ui/gtk3/glade/create_torrent_dialog.remote_path.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/create_torrent_dialog.remote_path.ui
rename to deluge/ui/gtk3/glade/create_torrent_dialog.remote_path.ui
diff --git a/deluge/ui/gtkui/glade/create_torrent_dialog.remote_save.ui b/deluge/ui/gtk3/glade/create_torrent_dialog.remote_save.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/create_torrent_dialog.remote_save.ui
rename to deluge/ui/gtk3/glade/create_torrent_dialog.remote_save.ui
diff --git a/deluge/ui/gtkui/glade/create_torrent_dialog.ui b/deluge/ui/gtk3/glade/create_torrent_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/create_torrent_dialog.ui
rename to deluge/ui/gtk3/glade/create_torrent_dialog.ui
diff --git a/deluge/ui/gtkui/glade/edit_trackers.add.ui b/deluge/ui/gtk3/glade/edit_trackers.add.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/edit_trackers.add.ui
rename to deluge/ui/gtk3/glade/edit_trackers.add.ui
diff --git a/deluge/ui/gtkui/glade/edit_trackers.edit.ui b/deluge/ui/gtk3/glade/edit_trackers.edit.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/edit_trackers.edit.ui
rename to deluge/ui/gtk3/glade/edit_trackers.edit.ui
diff --git a/deluge/ui/gtkui/glade/edit_trackers.ui b/deluge/ui/gtk3/glade/edit_trackers.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/edit_trackers.ui
rename to deluge/ui/gtk3/glade/edit_trackers.ui
diff --git a/deluge/ui/gtkui/glade/filtertree_menu.ui b/deluge/ui/gtk3/glade/filtertree_menu.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/filtertree_menu.ui
rename to deluge/ui/gtk3/glade/filtertree_menu.ui
diff --git a/deluge/ui/gtkui/glade/main_window.new_release.ui b/deluge/ui/gtk3/glade/main_window.new_release.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/main_window.new_release.ui
rename to deluge/ui/gtk3/glade/main_window.new_release.ui
diff --git a/deluge/ui/gtkui/glade/main_window.tabs.menu_file.ui b/deluge/ui/gtk3/glade/main_window.tabs.menu_file.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/main_window.tabs.menu_file.ui
rename to deluge/ui/gtk3/glade/main_window.tabs.menu_file.ui
diff --git a/deluge/ui/gtkui/glade/main_window.tabs.menu_peer.ui b/deluge/ui/gtk3/glade/main_window.tabs.menu_peer.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/main_window.tabs.menu_peer.ui
rename to deluge/ui/gtk3/glade/main_window.tabs.menu_peer.ui
diff --git a/deluge/ui/gtkui/glade/main_window.tabs.ui b/deluge/ui/gtk3/glade/main_window.tabs.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/main_window.tabs.ui
rename to deluge/ui/gtk3/glade/main_window.tabs.ui
diff --git a/deluge/ui/gtkui/glade/main_window.ui b/deluge/ui/gtk3/glade/main_window.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/main_window.ui
rename to deluge/ui/gtk3/glade/main_window.ui
diff --git a/deluge/ui/gtkui/glade/move_storage_dialog.ui b/deluge/ui/gtk3/glade/move_storage_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/move_storage_dialog.ui
rename to deluge/ui/gtk3/glade/move_storage_dialog.ui
diff --git a/deluge/ui/gtkui/glade/other_dialog.ui b/deluge/ui/gtk3/glade/other_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/other_dialog.ui
rename to deluge/ui/gtk3/glade/other_dialog.ui
diff --git a/deluge/ui/gtkui/glade/path_combo_chooser.ui b/deluge/ui/gtk3/glade/path_combo_chooser.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/path_combo_chooser.ui
rename to deluge/ui/gtk3/glade/path_combo_chooser.ui
diff --git a/deluge/ui/gtkui/glade/preferences_dialog.ui b/deluge/ui/gtk3/glade/preferences_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/preferences_dialog.ui
rename to deluge/ui/gtk3/glade/preferences_dialog.ui
diff --git a/deluge/ui/gtkui/glade/queuedtorrents.ui b/deluge/ui/gtk3/glade/queuedtorrents.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/queuedtorrents.ui
rename to deluge/ui/gtk3/glade/queuedtorrents.ui
diff --git a/deluge/ui/gtkui/glade/remove_torrent_dialog.ui b/deluge/ui/gtk3/glade/remove_torrent_dialog.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/remove_torrent_dialog.ui
rename to deluge/ui/gtk3/glade/remove_torrent_dialog.ui
diff --git a/deluge/ui/gtkui/glade/torrent_menu.options.ui b/deluge/ui/gtk3/glade/torrent_menu.options.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/torrent_menu.options.ui
rename to deluge/ui/gtk3/glade/torrent_menu.options.ui
diff --git a/deluge/ui/gtkui/glade/torrent_menu.queue.ui b/deluge/ui/gtk3/glade/torrent_menu.queue.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/torrent_menu.queue.ui
rename to deluge/ui/gtk3/glade/torrent_menu.queue.ui
diff --git a/deluge/ui/gtkui/glade/torrent_menu.ui b/deluge/ui/gtk3/glade/torrent_menu.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/torrent_menu.ui
rename to deluge/ui/gtk3/glade/torrent_menu.ui
diff --git a/deluge/ui/gtkui/glade/tray_menu.ui b/deluge/ui/gtk3/glade/tray_menu.ui
similarity index 100%
rename from deluge/ui/gtkui/glade/tray_menu.ui
rename to deluge/ui/gtk3/glade/tray_menu.ui
diff --git a/deluge/ui/gtkui/gtkui.py b/deluge/ui/gtk3/gtkui.py
similarity index 91%
rename from deluge/ui/gtkui/gtkui.py
rename to deluge/ui/gtk3/gtkui.py
index 5f3a115c1..f4b38fcb8 100644
--- a/deluge/ui/gtkui/gtkui.py
+++ b/deluge/ui/gtk3/gtkui.py
@@ -48,28 +48,30 @@ from deluge.common import (
 from deluge.configmanager import ConfigManager, get_config_dir
 from deluge.error import DaemonRunningError
 from deluge.ui.client import client
-from deluge.ui.gtkui.addtorrentdialog import AddTorrentDialog
-from deluge.ui.gtkui.common import associate_magnet_links
-from deluge.ui.gtkui.connectionmanager import ConnectionManager
-from deluge.ui.gtkui.dialogs import YesNoDialog
-from deluge.ui.gtkui.filtertreeview import FilterTreeView
-from deluge.ui.gtkui.ipcinterface import IPCInterface, process_args
-from deluge.ui.gtkui.mainwindow import MainWindow
-from deluge.ui.gtkui.menubar import MenuBar
-from deluge.ui.gtkui.pluginmanager import PluginManager
-from deluge.ui.gtkui.preferences import Preferences
-from deluge.ui.gtkui.queuedtorrents import QueuedTorrents
-from deluge.ui.gtkui.sidebar import SideBar
-from deluge.ui.gtkui.statusbar import StatusBar
-from deluge.ui.gtkui.systemtray import SystemTray
-from deluge.ui.gtkui.toolbar import ToolBar
-from deluge.ui.gtkui.torrentdetails import TorrentDetails
-from deluge.ui.gtkui.torrentview import TorrentView
 from deluge.ui.hostlist import LOCALHOST
 from deluge.ui.sessionproxy import SessionProxy
 from deluge.ui.tracker_icons import TrackerIcons
 from deluge.ui.translations_util import set_language, setup_translations
 
+# isort:imports-localfolder
+from .addtorrentdialog import AddTorrentDialog
+from .common import associate_magnet_links
+from .connectionmanager import ConnectionManager
+from .dialogs import YesNoDialog
+from .filtertreeview import FilterTreeView
+from .ipcinterface import IPCInterface, process_args
+from .mainwindow import MainWindow
+from .menubar import MenuBar
+from .pluginmanager import PluginManager
+from .preferences import Preferences
+from .queuedtorrents import QueuedTorrents
+from .sidebar import SideBar
+from .statusbar import StatusBar
+from .systemtray import SystemTray
+from .toolbar import ToolBar
+from .torrentdetails import TorrentDetails
+from .torrentview import TorrentView
+
 set_prgname('deluge')
 log = logging.getLogger(__name__)
 
@@ -175,12 +177,12 @@ class GtkUI(object):
         # if already set by another program.
         associate_magnet_links(False)
 
-        # Make sure gtkui.conf has at least the defaults set
-        self.config = ConfigManager('gtkui.conf', DEFAULT_PREFS)
+        # Make sure gtk3ui.conf has at least the defaults set
+        self.config = ConfigManager('gtk3ui.conf', DEFAULT_PREFS)
 
         # Make sure the gtkui state folder has been created
-        if not os.path.exists(os.path.join(get_config_dir(), 'gtkui_state')):
-            os.makedirs(os.path.join(get_config_dir(), 'gtkui_state'))
+        if not os.path.exists(os.path.join(get_config_dir(), 'gtk3ui_state')):
+            os.makedirs(os.path.join(get_config_dir(), 'gtk3ui_state'))
 
         # Set language
         if self.config['language'] is not None:
@@ -222,7 +224,7 @@ class GtkUI(object):
                 process_args([filename])
 
             self.osxapp.connect('NSApplicationOpenFile', nsapp_open_file)
-            from deluge.ui.gtkui.menubar_osx import menubar_osx
+            from .menubar_osx import menubar_osx
 
             menubar_osx(self, self.osxapp)
             self.osxapp.ready()
diff --git a/deluge/ui/gtkui/ipcinterface.py b/deluge/ui/gtk3/ipcinterface.py
similarity index 98%
rename from deluge/ui/gtkui/ipcinterface.py
rename to deluge/ui/gtk3/ipcinterface.py
index 175d0ccfa..90207d392 100644
--- a/deluge/ui/gtkui/ipcinterface.py
+++ b/deluge/ui/gtk3/ipcinterface.py
@@ -46,7 +46,7 @@ class IPCProtocolServer(Protocol):
         pass
 
     def dataReceived(self, data):  # NOQA: N802
-        config = ConfigManager('gtkui.conf')
+        config = ConfigManager('gtk3ui.conf')
         data = rencode.loads(data, decode_utf8=True)
         if not data or config['focus_main_window_on_add']:
             component.get('MainWindow').present()
@@ -192,7 +192,7 @@ def process_args(args):
         log.debug('Not connected to host.. Adding to queue.')
         component.get('QueuedTorrents').add_to_queue(args)
         return
-    config = ConfigManager('gtkui.conf')
+    config = ConfigManager('gtk3ui.conf')
 
     for arg in args:
         if not arg.strip():
diff --git a/deluge/ui/gtkui/listview.py b/deluge/ui/gtk3/listview.py
similarity index 99%
rename from deluge/ui/gtkui/listview.py
rename to deluge/ui/gtk3/listview.py
index 1968e61b9..fed84c7ab 100644
--- a/deluge/ui/gtkui/listview.py
+++ b/deluge/ui/gtk3/listview.py
@@ -16,7 +16,8 @@ from gi.repository.Gdk import Event  # pylint: disable=ungrouped-imports
 from gi.repository.GObject import SIGNAL_RUN_LAST, TYPE_NONE, signal_new
 
 from deluge.common import decode_bytes
-from deluge.ui.gtkui.common import load_pickled_state_file, save_pickled_state_file
+
+from .common import load_pickled_state_file, save_pickled_state_file
 
 # FIXME: ?
 signal_new(
@@ -26,12 +27,8 @@ signal_new(
 log = logging.getLogger(__name__)
 
 
-class ListViewColumnState:  # pylint: disable=old-style-class
-    """
-    Class used for saving/loading column state.
-
-    Note: This must be old style class to avoid breaking existing user state file.
-    """
+class ListViewColumnState(object):
+    """Class used for saving/loading column state."""
 
     def __init__(self, name, position, width, visible, sort, sort_order):
         self.name = name
diff --git a/deluge/ui/gtkui/mainwindow.py b/deluge/ui/gtk3/mainwindow.py
similarity index 96%
rename from deluge/ui/gtkui/mainwindow.py
rename to deluge/ui/gtk3/mainwindow.py
index 9403916e0..e5534c0c6 100644
--- a/deluge/ui/gtkui/mainwindow.py
+++ b/deluge/ui/gtk3/mainwindow.py
@@ -19,12 +19,13 @@ from twisted.internet import reactor
 from twisted.internet.error import ReactorNotRunning
 
 import deluge.component as component
-import deluge.ui.gtkui.common
 from deluge.common import fspeed, resource_filename
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui.dialogs import PasswordDialog
-from deluge.ui.gtkui.ipcinterface import process_args
+
+from .common import get_deluge_icon
+from .dialogs import PasswordDialog
+from .ipcinterface import process_args
 
 try:
     import gi
@@ -66,7 +67,7 @@ class MainWindow(component.Component):
         if Wnck:
             self.screen = Wnck.Screen.get_default()
         component.Component.__init__(self, 'MainWindow', interval=2)
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         self.main_builder = Gtk.Builder()
 
         # Patch this GtkBuilder to avoid connecting signals from elsewhere
@@ -86,19 +87,20 @@ class MainWindow(component.Component):
         self.main_builder.connect_signals = patched_connect_signals
 
         # Get Gtk Builder files Main Window, New release dialog, and Tabs.
-        for filename in (
+        ui_filenames = [
             'main_window.ui',
             'main_window.new_release.ui',
             'main_window.tabs.ui',
             'main_window.tabs.menu_file.ui',
             'main_window.tabs.menu_peer.ui',
-        ):
+        ]
+        for filename in ui_filenames:
             self.main_builder.add_from_file(
-                resource_filename('deluge.ui.gtkui', os.path.join('glade', filename))
+                resource_filename(__package__, os.path.join('glade', filename))
             )
 
         self.window = self.main_builder.get_object('main_window')
-        self.window.set_icon(deluge.ui.gtkui.common.get_deluge_icon())
+        self.window.set_icon(get_deluge_icon())
         self.vpaned = self.main_builder.get_object('vpaned')
         self.initial_vpaned_position = self.config['window_pane_position']
 
@@ -330,7 +332,7 @@ class MainWindow(component.Component):
 
     def on_newversionavailable_event(self, new_version):
         if self.config['show_new_releases']:
-            from deluge.ui.gtkui.new_release_dialog import NewReleaseDialog
+            from .new_release_dialog import NewReleaseDialog
 
             reactor.callLater(5.0, NewReleaseDialog().show, new_version)
 
diff --git a/deluge/ui/gtkui/menubar.py b/deluge/ui/gtk3/menubar.py
similarity index 96%
rename from deluge/ui/gtkui/menubar.py
rename to deluge/ui/gtk3/menubar.py
index 35eea9b91..d94d1a950 100644
--- a/deluge/ui/gtkui/menubar.py
+++ b/deluge/ui/gtk3/menubar.py
@@ -20,8 +20,9 @@ import deluge.common
 import deluge.component as component
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui.dialogs import ErrorDialog, OtherDialog
-from deluge.ui.gtkui.path_chooser import PathChooser
+
+from .dialogs import ErrorDialog, OtherDialog
+from .path_chooser import PathChooser
 
 log = logging.getLogger(__name__)
 
@@ -32,25 +33,25 @@ class MenuBar(component.Component):
         component.Component.__init__(self, 'MenuBar')
         self.mainwindow = component.get('MainWindow')
         self.main_builder = self.mainwindow.get_builder()
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
 
         self.builder = Gtk.Builder()
         # Get the torrent menu from the gtk builder file
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'torrent_menu.ui')
+                __package__, os.path.join('glade', 'torrent_menu.ui')
             )
         )
         # Get the torrent options menu from the gtk builder file
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'torrent_menu.options.ui')
+                __package__, os.path.join('glade', 'torrent_menu.options.ui')
             )
         )
         # Get the torrent queue menu from the gtk builder file
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'torrent_menu.queue.ui')
+                __package__, os.path.join('glade', 'torrent_menu.queue.ui')
             )
         )
 
@@ -249,7 +250,7 @@ class MenuBar(component.Component):
 
     def on_menuitem_createtorrent_activate(self, data=None):
         log.debug('on_menuitem_createtorrent_activate')
-        from deluge.ui.gtkui.createtorrentdialog import CreateTorrentDialog
+        from .createtorrentdialog import CreateTorrentDialog
 
         CreateTorrentDialog().show()
 
@@ -287,7 +288,7 @@ class MenuBar(component.Component):
 
     def on_menuitem_edittrackers_activate(self, data=None):
         log.debug('on_menuitem_edittrackers_activate')
-        from deluge.ui.gtkui.edittrackersdialog import EditTrackersDialog
+        from .edittrackersdialog import EditTrackersDialog
 
         dialog = EditTrackersDialog(
             component.get('TorrentView').get_selected_torrent(), self.mainwindow.window
@@ -298,7 +299,7 @@ class MenuBar(component.Component):
         log.debug('on_menuitem_remove_activate')
         torrent_ids = component.get('TorrentView').get_selected_torrents()
         if torrent_ids:
-            from deluge.ui.gtkui.removetorrentdialog import RemoveTorrentDialog
+            from .removetorrentdialog import RemoveTorrentDialog
 
             RemoveTorrentDialog(torrent_ids).run()
 
@@ -332,7 +333,7 @@ class MenuBar(component.Component):
         builder = Gtk.Builder()
         builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'move_storage_dialog.ui')
+                __package__, os.path.join('glade', 'move_storage_dialog.ui')
             )
         )
         # Keep it referenced:
@@ -411,7 +412,7 @@ class MenuBar(component.Component):
 
     def on_menuitem_about_activate(self, data=None):
         log.debug('on_menuitem_about_activate')
-        from deluge.ui.gtkui.aboutdialog import AboutDialog
+        from .aboutdialog import AboutDialog
 
         AboutDialog().run()
 
diff --git a/deluge/ui/gtkui/menubar_osx.py b/deluge/ui/gtk3/menubar_osx.py
similarity index 98%
rename from deluge/ui/gtkui/menubar_osx.py
rename to deluge/ui/gtk3/menubar_osx.py
index 2f282cbcd..1df6fab08 100644
--- a/deluge/ui/gtkui/menubar_osx.py
+++ b/deluge/ui/gtk3/menubar_osx.py
@@ -31,7 +31,7 @@ def menubar_osx(gtkui, osxapp):
     menubar = main_builder.get_object('menubar')
     group = accel_groups_from_object(gtkui.mainwindow.window)[0]
 
-    config = ConfigManager('gtkui.conf')
+    config = ConfigManager('gtk3ui.conf')
 
     # NOTE: accel maps doesn't work with glade file format
     # because of libglade not setting MenuItem accel groups
diff --git a/deluge/ui/gtkui/new_release_dialog.py b/deluge/ui/gtk3/new_release_dialog.py
similarity index 98%
rename from deluge/ui/gtkui/new_release_dialog.py
rename to deluge/ui/gtk3/new_release_dialog.py
index 246fc0ec8..dffff61e8 100644
--- a/deluge/ui/gtkui/new_release_dialog.py
+++ b/deluge/ui/gtk3/new_release_dialog.py
@@ -20,7 +20,7 @@ class NewReleaseDialog(object):
         pass
 
     def show(self, available_version):
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         main_builder = component.get('MainWindow').get_builder()
         self.dialog = main_builder.get_object('new_release_dialog')
         # Set the version labels
diff --git a/deluge/ui/gtkui/options_tab.py b/deluge/ui/gtk3/options_tab.py
similarity index 98%
rename from deluge/ui/gtkui/options_tab.py
rename to deluge/ui/gtk3/options_tab.py
index 0e75fabdb..d088ef429 100644
--- a/deluge/ui/gtkui/options_tab.py
+++ b/deluge/ui/gtk3/options_tab.py
@@ -14,8 +14,9 @@ from gi.repository.Gdk import keyval_name
 
 import deluge.component as component
 from deluge.ui.client import client
-from deluge.ui.gtkui.path_chooser import PathChooser
-from deluge.ui.gtkui.torrentdetails import Tab
+
+from .path_chooser import PathChooser
+from .torrentdetails import Tab
 
 
 class OptionsTab(Tab):
diff --git a/deluge/ui/gtkui/path_chooser.py b/deluge/ui/gtk3/path_chooser.py
similarity index 99%
rename from deluge/ui/gtkui/path_chooser.py
rename to deluge/ui/gtk3/path_chooser.py
index 7bf081de0..798a02a7d 100644
--- a/deluge/ui/gtkui/path_chooser.py
+++ b/deluge/ui/gtk3/path_chooser.py
@@ -13,7 +13,8 @@ import logging
 
 import deluge.component as component
 from deluge.ui.client import client
-from deluge.ui.gtkui.path_combo_chooser import PathChooserComboBox
+
+from .path_combo_chooser import PathChooserComboBox
 
 log = logging.getLogger(__name__)
 
diff --git a/deluge/ui/gtkui/path_combo_chooser.py b/deluge/ui/gtk3/path_combo_chooser.py
similarity index 99%
rename from deluge/ui/gtkui/path_combo_chooser.py
rename to deluge/ui/gtk3/path_combo_chooser.py
index 0dc0b7383..754240c44 100755
--- a/deluge/ui/gtkui/path_combo_chooser.py
+++ b/deluge/ui/gtk3/path_combo_chooser.py
@@ -1141,7 +1141,7 @@ class PathChooserComboBox(GtkGI.Box, StoredValuesPopup, GObject.GObject):
         self.popup_buttonbox = self.builder.get_object('buttonbox')
         self.builder.add_from_file(
             resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'path_combo_chooser.ui')
+                __package__, os.path.join('glade', 'path_combo_chooser.ui')
             )
         )
         self.button_toggle = self.builder.get_object('button_toggle_dropdown')
diff --git a/deluge/ui/gtkui/peers_tab.py b/deluge/ui/gtk3/peers_tab.py
similarity index 98%
rename from deluge/ui/gtkui/peers_tab.py
rename to deluge/ui/gtk3/peers_tab.py
index dc729911a..46f8bb4d7 100644
--- a/deluge/ui/gtkui/peers_tab.py
+++ b/deluge/ui/gtk3/peers_tab.py
@@ -27,14 +27,15 @@ import deluge.common
 import deluge.component as component
 from deluge.ui.client import client
 from deluge.ui.countries import COUNTRIES
-from deluge.ui.gtkui.common import (
+
+from .common import (
     icon_downloading,
     icon_seeding,
     load_pickled_state_file,
     save_pickled_state_file,
 )
-from deluge.ui.gtkui.torrentdetails import Tab
-from deluge.ui.gtkui.torrentview_data_funcs import (
+from .torrentdetails import Tab
+from .torrentview_data_funcs import (
     cell_data_peer_progress,
     cell_data_speed_down,
     cell_data_speed_up,
@@ -369,7 +370,7 @@ class PeersTab(Tab):
         builder = Builder()
         builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'connect_peer_dialog.ui')
+                __package__, os.path.join('glade', 'connect_peer_dialog.ui')
             )
         )
         peer_dialog = builder.get_object('connect_peer_dialog')
diff --git a/deluge/ui/gtkui/piecesbar.py b/deluge/ui/gtk3/piecesbar.py
similarity index 99%
rename from deluge/ui/gtkui/piecesbar.py
rename to deluge/ui/gtk3/piecesbar.py
index 5e6e259fb..389f2e1f8 100644
--- a/deluge/ui/gtkui/piecesbar.py
+++ b/deluge/ui/gtk3/piecesbar.py
@@ -41,7 +41,7 @@ class PiecesBar(DrawingArea):
         del pb, pb_style
 
         self.set_size_request(-1, 25)
-        self.gtkui_config = ConfigManager('gtkui.conf')
+        self.gtkui_config = ConfigManager('gtk3ui.conf')
 
         self.width = self.prev_width = 0
         self.height = self.prev_height = 0
diff --git a/deluge/ui/gtkui/pluginmanager.py b/deluge/ui/gtk3/pluginmanager.py
similarity index 97%
rename from deluge/ui/gtkui/pluginmanager.py
rename to deluge/ui/gtk3/pluginmanager.py
index 986a60aa5..75a62f825 100644
--- a/deluge/ui/gtkui/pluginmanager.py
+++ b/deluge/ui/gtk3/pluginmanager.py
@@ -22,9 +22,9 @@ log = logging.getLogger(__name__)
 class PluginManager(deluge.pluginmanagerbase.PluginManagerBase, component.Component):
     def __init__(self):
         component.Component.__init__(self, 'PluginManager')
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         deluge.pluginmanagerbase.PluginManagerBase.__init__(
-            self, 'gtkui.conf', 'deluge.plugin.gtkui'
+            self, 'gtk3ui.conf', 'deluge.plugin.gtk3'
         )
 
         self.hooks = {'on_apply_prefs': [], 'on_show_prefs': []}
diff --git a/deluge/ui/gtkui/preferences.py b/deluge/ui/gtk3/preferences.py
similarity index 99%
rename from deluge/ui/gtkui/preferences.py
rename to deluge/ui/gtk3/preferences.py
index 3f697df54..d3a1c77b7 100644
--- a/deluge/ui/gtkui/preferences.py
+++ b/deluge/ui/gtk3/preferences.py
@@ -23,20 +23,12 @@ from deluge.configmanager import ConfigManager, get_config_dir
 from deluge.error import AuthManagerError, NotAuthorizedError
 from deluge.ui.client import client
 from deluge.ui.common import DISK_CACHE_KEYS, PREFS_CATOG_TRANS
-from deluge.ui.gtkui.common import (
-    associate_magnet_links,
-    get_clipboard_text,
-    get_deluge_icon,
-)
-from deluge.ui.gtkui.dialogs import (
-    AccountDialog,
-    ErrorDialog,
-    InformationDialog,
-    YesNoDialog,
-)
-from deluge.ui.gtkui.path_chooser import PathChooser
 from deluge.ui.translations_util import get_languages
 
+from .common import associate_magnet_links, get_clipboard_text, get_deluge_icon
+from .dialogs import AccountDialog, ErrorDialog, InformationDialog, YesNoDialog
+from .path_chooser import PathChooser
+
 try:
     from urllib.parse import urlparse
 except ImportError:
@@ -67,7 +59,7 @@ class Preferences(component.Component):
         self.builder = Gtk.Builder()
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'preferences_dialog.ui')
+                __package__, os.path.join('glade', 'preferences_dialog.ui')
             )
         )
         self.pref_dialog = self.builder.get_object('pref_dialog')
@@ -75,7 +67,7 @@ class Preferences(component.Component):
         self.pref_dialog.set_icon(get_deluge_icon())
         self.treeview = self.builder.get_object('treeview')
         self.notebook = self.builder.get_object('notebook')
-        self.gtkui_config = ConfigManager('gtkui.conf')
+        self.gtkui_config = ConfigManager('gtk3ui.conf')
         self.window_open = False
 
         self.load_pref_dialog_state()
@@ -178,7 +170,7 @@ class Preferences(component.Component):
         # Radio buttons to choose between systray and appindicator
         self.builder.get_object('alignment_tray_type').set_visible(bool(appindicator))
 
-        from deluge.ui.gtkui.gtkui import DEFAULT_PREFS
+        from .gtkui import DEFAULT_PREFS
 
         self.COLOR_DEFAULTS = {}
         for key in ('missing', 'waiting', 'downloading', 'completed'):
diff --git a/deluge/ui/gtkui/queuedtorrents.py b/deluge/ui/gtk3/queuedtorrents.py
similarity index 96%
rename from deluge/ui/gtkui/queuedtorrents.py
rename to deluge/ui/gtk3/queuedtorrents.py
index 38ce1bcc7..6babfa6f4 100644
--- a/deluge/ui/gtkui/queuedtorrents.py
+++ b/deluge/ui/gtk3/queuedtorrents.py
@@ -24,8 +24,9 @@ from gi.repository.Gtk import (
 import deluge.common
 import deluge.component as component
 from deluge.configmanager import ConfigManager
-from deluge.ui.gtkui.common import get_logo
-from deluge.ui.gtkui.ipcinterface import process_args
+
+from .common import get_logo
+from .ipcinterface import process_args
 
 log = logging.getLogger(__name__)
 
@@ -38,11 +39,11 @@ class QueuedTorrents(component.Component):
         self.queue = []
         self.status_item = None
 
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         self.builder = Builder()
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'queuedtorrents.ui')
+                __package__, os.path.join('glade', 'queuedtorrents.ui')
             )
         )
         self.builder.get_object('chk_autoadd').set_active(self.config['autoadd_queued'])
diff --git a/deluge/ui/gtkui/removetorrentdialog.py b/deluge/ui/gtk3/removetorrentdialog.py
similarity index 97%
rename from deluge/ui/gtkui/removetorrentdialog.py
rename to deluge/ui/gtk3/removetorrentdialog.py
index d5d627a2a..48806a5d5 100644
--- a/deluge/ui/gtkui/removetorrentdialog.py
+++ b/deluge/ui/gtk3/removetorrentdialog.py
@@ -45,7 +45,7 @@ class RemoveTorrentDialog(object):
         self.builder = Gtk.Builder()
         self.builder.add_from_file(
             deluge.common.resource_filename(
-                'deluge.ui.gtkui', os.path.join('glade', 'remove_torrent_dialog.ui')
+                __package__, os.path.join('glade', 'remove_torrent_dialog.ui')
             )
         )
 
diff --git a/deluge/ui/gtkui/sidebar.py b/deluge/ui/gtk3/sidebar.py
similarity index 98%
rename from deluge/ui/gtkui/sidebar.py
rename to deluge/ui/gtk3/sidebar.py
index 8d2a8fed4..47d9ebdc4 100644
--- a/deluge/ui/gtkui/sidebar.py
+++ b/deluge/ui/gtk3/sidebar.py
@@ -31,7 +31,7 @@ class SideBar(component.Component):
         main_builder = component.get('MainWindow').get_builder()
         self.notebook = main_builder.get_object('sidebar_notebook')
         self.hpaned = main_builder.get_object('main_window_hpaned')
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         # self.hpaned_position = self.hpaned.get_position()
 
         # Tabs holds references to the Tab widgets by their name
diff --git a/deluge/ui/gtkui/status_tab.py b/deluge/ui/gtk3/status_tab.py
similarity index 96%
rename from deluge/ui/gtkui/status_tab.py
rename to deluge/ui/gtk3/status_tab.py
index 8a70aa1ec..4dfba392d 100644
--- a/deluge/ui/gtkui/status_tab.py
+++ b/deluge/ui/gtk3/status_tab.py
@@ -14,8 +14,9 @@ import logging
 import deluge.component as component
 from deluge.common import fpeer
 from deluge.configmanager import ConfigManager
-from deluge.ui.gtkui.piecesbar import PiecesBar
-from deluge.ui.gtkui.tab_data_funcs import (
+
+from .piecesbar import PiecesBar
+from .tab_data_funcs import (
     fdate_or_never,
     fpcnt,
     fratio,
@@ -24,7 +25,7 @@ from deluge.ui.gtkui.tab_data_funcs import (
     ftime_or_dash,
     ftotal_sized,
 )
-from deluge.ui.gtkui.torrentdetails import Tab, TabWidget
+from .torrentdetails import Tab, TabWidget
 
 log = logging.getLogger(__name__)
 
@@ -33,7 +34,7 @@ class StatusTab(Tab):
     def __init__(self):
         super(StatusTab, self).__init__('Status', 'status_tab', 'status_tab_label')
 
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
 
         self.progressbar = self.main_builder.get_object('progressbar')
         self.piecesbar = None
diff --git a/deluge/ui/gtkui/statusbar.py b/deluge/ui/gtk3/statusbar.py
similarity index 98%
rename from deluge/ui/gtkui/statusbar.py
rename to deluge/ui/gtk3/statusbar.py
index 834d84d7b..7834da0a2 100644
--- a/deluge/ui/gtkui/statusbar.py
+++ b/deluge/ui/gtk3/statusbar.py
@@ -18,7 +18,9 @@ import deluge.component as component
 from deluge.common import fsize, fspeed, get_pixmap
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui import common, dialogs
+
+from .common import build_menu_radio_list
+from .dialogs import OtherDialog
 
 log = logging.getLogger(__name__)
 
@@ -111,7 +113,7 @@ class StatusBar(component.Component):
         component.Component.__init__(self, 'StatusBar', interval=3)
         main_builder = component.get('MainWindow').get_builder()
         self.statusbar = main_builder.get_object('statusbar')
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
 
         # Status variables that are updated via callback
         self.max_connections_global = -1
@@ -495,14 +497,14 @@ class StatusBar(component.Component):
                 if response_id == Gtk.ResponseType.OK:
                     set_value(dialog.get_value())
 
-            dialog = dialogs.OtherDialog(*other_dialog_info[core_key])
+            dialog = OtherDialog(*other_dialog_info[core_key])
             dialog.run().addCallback(set_value)
         else:
             value = widget.get_children()[0].get_text().split(' ')[0]
             set_value(value)
 
     def _on_download_item_clicked(self, widget, event):
-        menu = common.build_menu_radio_list(
+        menu = build_menu_radio_list(
             self.config['tray_download_speed_list'],
             self._on_set_download_speed,
             self.max_download_speed,
@@ -518,7 +520,7 @@ class StatusBar(component.Component):
         self.set_limit_value(widget, 'max_download_speed')
 
     def _on_upload_item_clicked(self, widget, event):
-        menu = common.build_menu_radio_list(
+        menu = build_menu_radio_list(
             self.config['tray_upload_speed_list'],
             self._on_set_upload_speed,
             self.max_upload_speed,
@@ -534,7 +536,7 @@ class StatusBar(component.Component):
         self.set_limit_value(widget, 'max_upload_speed')
 
     def _on_connection_item_clicked(self, widget, event):
-        menu = common.build_menu_radio_list(
+        menu = build_menu_radio_list(
             self.config['connection_limit_list'],
             self._on_set_connection_limit,
             self.max_connections_global,
diff --git a/deluge/ui/gtkui/systemtray.py b/deluge/ui/gtk3/systemtray.py
similarity index 98%
rename from deluge/ui/gtkui/systemtray.py
rename to deluge/ui/gtk3/systemtray.py
index f8dcc8252..4709c3502 100644
--- a/deluge/ui/gtkui/systemtray.py
+++ b/deluge/ui/gtk3/systemtray.py
@@ -24,8 +24,9 @@ from deluge.common import (
 )
 from deluge.configmanager import ConfigManager
 from deluge.ui.client import client
-from deluge.ui.gtkui import dialogs
-from deluge.ui.gtkui.common import build_menu_radio_list, get_logo
+
+from .common import build_menu_radio_list, get_logo
+from .dialogs import OtherDialog
 
 try:
     import appindicator
@@ -39,7 +40,7 @@ class SystemTray(component.Component):
     def __init__(self):
         component.Component.__init__(self, 'SystemTray', interval=4)
         self.mainwindow = component.get('MainWindow')
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         # List of widgets that need to be hidden when not connected to a host
         self.hide_widget_list = [
             'menuitem_add_torrent',
@@ -76,7 +77,7 @@ class SystemTray(component.Component):
         """Enables the system tray icon."""
         self.builder = Builder()
         self.builder.add_from_file(
-            resource_filename('deluge.ui.gtkui', os.path.join('glade', 'tray_menu.ui'))
+            resource_filename(__package__, os.path.join('glade', 'tray_menu.ui'))
         )
 
         self.builder.connect_signals(self)
@@ -436,7 +437,7 @@ class SystemTray(component.Component):
         if widget.get_name() == 'unlimited':
             set_value(-1)
         elif widget.get_name() == 'other':
-            dialog = dialogs.OtherDialog(header, text, _('K/s'), image, default)
+            dialog = OtherDialog(header, text, _('K/s'), image, default)
             dialog.run().addCallback(set_value)
         else:
             set_value(widget.get_children()[0].get_text().split(' ')[0])
diff --git a/deluge/ui/gtkui/tab_data_funcs.py b/deluge/ui/gtk3/tab_data_funcs.py
similarity index 100%
rename from deluge/ui/gtkui/tab_data_funcs.py
rename to deluge/ui/gtk3/tab_data_funcs.py
diff --git a/deluge/ui/gtkui/toolbar.py b/deluge/ui/gtk3/toolbar.py
similarity index 98%
rename from deluge/ui/gtkui/toolbar.py
rename to deluge/ui/gtk3/toolbar.py
index 98fe7459f..7bc029e4b 100644
--- a/deluge/ui/gtkui/toolbar.py
+++ b/deluge/ui/gtk3/toolbar.py
@@ -26,7 +26,7 @@ class ToolBar(component.Component):
         mainwindow = component.get('MainWindow')
         self.main_builder = mainwindow.get_builder()
         self.toolbar = self.main_builder.get_object('toolbar')
-        self.config = ConfigManager('gtkui.conf')
+        self.config = ConfigManager('gtk3ui.conf')
         # Connect main window Signals #
         mainwindow.connect_signals(self)
         self.change_sensitivity = [
diff --git a/deluge/ui/gtkui/torrentdetails.py b/deluge/ui/gtk3/torrentdetails.py
similarity index 97%
rename from deluge/ui/gtkui/torrentdetails.py
rename to deluge/ui/gtk3/torrentdetails.py
index 35c220f2a..6bfa4668a 100644
--- a/deluge/ui/gtkui/torrentdetails.py
+++ b/deluge/ui/gtk3/torrentdetails.py
@@ -18,7 +18,8 @@ from gi.repository.Gtk import CheckMenuItem, Menu, SeparatorMenuItem
 
 import deluge.component as component
 from deluge.ui.client import client
-from deluge.ui.gtkui.common import load_pickled_state_file, save_pickled_state_file
+
+from .common import load_pickled_state_file, save_pickled_state_file
 
 log = logging.getLogger(__name__)
 
@@ -111,12 +112,12 @@ class TorrentDetails(component.Component):
         self.tabs = {}
 
         # Add the default tabs
-        from deluge.ui.gtkui.status_tab import StatusTab
-        from deluge.ui.gtkui.details_tab import DetailsTab
-        from deluge.ui.gtkui.files_tab import FilesTab
-        from deluge.ui.gtkui.peers_tab import PeersTab
-        from deluge.ui.gtkui.options_tab import OptionsTab
-        from deluge.ui.gtkui.trackers_tab import TrackersTab
+        from .status_tab import StatusTab
+        from .details_tab import DetailsTab
+        from .files_tab import FilesTab
+        from .peers_tab import PeersTab
+        from .options_tab import OptionsTab
+        from .trackers_tab import TrackersTab
 
         default_tabs = {
             'Status': StatusTab,
diff --git a/deluge/ui/gtkui/torrentview.py b/deluge/ui/gtk3/torrentview.py
similarity index 99%
rename from deluge/ui/gtkui/torrentview.py
rename to deluge/ui/gtk3/torrentview.py
index 2443c7f7a..9eef68d9d 100644
--- a/deluge/ui/gtkui/torrentview.py
+++ b/deluge/ui/gtk3/torrentview.py
@@ -20,9 +20,10 @@ from twisted.internet import reactor
 
 import deluge.component as component
 from deluge.ui.client import client
-from deluge.ui.gtkui import torrentview_data_funcs as funcs
-from deluge.ui.gtkui.listview import ListView
-from deluge.ui.gtkui.removetorrentdialog import RemoveTorrentDialog
+
+from . import torrentview_data_funcs as funcs
+from .listview import ListView
+from .removetorrentdialog import RemoveTorrentDialog
 
 log = logging.getLogger(__name__)
 
diff --git a/deluge/ui/gtkui/torrentview_data_funcs.py b/deluge/ui/gtk3/torrentview_data_funcs.py
similarity index 99%
rename from deluge/ui/gtkui/torrentview_data_funcs.py
rename to deluge/ui/gtk3/torrentview_data_funcs.py
index d4da75831..8bd1f9c51 100644
--- a/deluge/ui/gtkui/torrentview_data_funcs.py
+++ b/deluge/ui/gtk3/torrentview_data_funcs.py
@@ -14,7 +14,8 @@ from functools import partial
 
 import deluge.common as common
 import deluge.component as component
-from deluge.ui.gtkui.common import (
+
+from .common import (
     create_blank_pixbuf,
     get_pixbuf_at_size,
     icon_alert,
diff --git a/deluge/ui/gtkui/trackers_tab.py b/deluge/ui/gtk3/trackers_tab.py
similarity index 92%
rename from deluge/ui/gtkui/trackers_tab.py
rename to deluge/ui/gtk3/trackers_tab.py
index 55999761b..d83b9956c 100644
--- a/deluge/ui/gtkui/trackers_tab.py
+++ b/deluge/ui/gtk3/trackers_tab.py
@@ -13,8 +13,9 @@ import logging
 
 import deluge.component as component
 from deluge.common import ftime
-from deluge.ui.gtkui.tab_data_funcs import fcount, ftranslate, fyes_no
-from deluge.ui.gtkui.torrentdetails import Tab
+
+from .tab_data_funcs import fcount, ftranslate, fyes_no
+from .torrentdetails import Tab
 
 log = logging.getLogger(__name__)
 
@@ -67,7 +68,7 @@ class TrackersTab(Tab):
     def on_button_edit_trackers_clicked(self, button):
         torrent_id = component.get('TorrentView').get_selected_torrent()
         if torrent_id:
-            from deluge.ui.gtkui.edittrackersdialog import EditTrackersDialog
+            from .edittrackersdialog import EditTrackersDialog
 
             dialog = EditTrackersDialog(torrent_id, component.get('MainWindow').window)
             dialog.run()
diff --git a/docs/source/conf.py b/docs/source/conf.py
index e1a60a14a..7c57e058e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -101,6 +101,7 @@ autodoc_mock_imports = [
     'pango',
     'cairo',
     'pangocairo',
+    'gi',
     'curses',
     'win32api',
     'win32file',
diff --git a/setup.cfg b/setup.cfg
index 521a15dd2..4f15bcef5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -22,7 +22,7 @@ known_third_party =
 # Ignore Windows specific modules.
     bbfreeze, win32verstamp,
 # Ignore gtk modules, primarily for tox testing.
-    pygtk, gtk, gobject, gtk.gdk, pango, cairo, pangocairo,
+    pygtk, gtk, gobject, gtk.gdk, pango, cairo, pangocairo, gi
 # Ignore other module dependencies for pre-commit isort.
     twisted, OpenSSL, pytest, recommonmark, chardet, pkg_resources, zope, mock,
     sphinx
@@ -39,7 +39,7 @@ use_parentheses=True
 [flake8]
 max-line-length = 120
 builtins = _,_n,__request__
-exclude = .git,.tox,dist,build
+exclude = .git,.tox,.eggs,dist,build
 ignore =
 # A003 Class attribute is a python builtin.
     A003,
diff --git a/setup.py b/setup.py
index df8d966a4..041617bc7 100755
--- a/setup.py
+++ b/setup.py
@@ -502,16 +502,16 @@ if windows_check():
     )
 _entry_points['gui_scripts'] = [
     'deluge = deluge.ui.ui_entry:start_ui',
-    'deluge-gtk = deluge.ui.gtkui:start',
+    'deluge-gtk = deluge.ui.gtk3:start',
 ]
 _entry_points['deluge.ui'] = [
     'console = deluge.ui.console:Console',
     'web = deluge.ui.web:Web',
-    'gtk = deluge.ui.gtkui:Gtk',
+    'gtk = deluge.ui.gtk3:Gtk',
 ]
 
 
-_package_data['deluge'] = [
+_package_data['deluge.ui'] = [
     'ui/data/pixmaps/*.png',
     'ui/data/pixmaps/*.svg',
     'ui/data/pixmaps/*.ico',
@@ -535,7 +535,7 @@ _package_data['deluge.ui.web'] = [
     'themes/images/*/*/*.gif',
     'themes/images/*/*/*.png',
 ]
-_package_data['deluge.ui.gtkui'] = ['glade/*.ui']
+_package_data['deluge.ui.gtk3'] = ['glade/*.ui']
 
 setup_requires = ['setuptools', 'wheel']
 install_requires = [