Ubiquity fails to build with GTK4

[Jean-Baptiste Lallement]

With latest updates applied on impish Ubiquity fails to build with:

make: Leaving directory '/home/j-lallement/shared/Ubuntu/Dev/ubiquity/src'
/home/j-lallement/shared/Ubuntu/Dev/ubiquity/tests/test_gtkwidgets.py:9: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '4.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, TimezoneMap
/home/j-lallement/shared/Ubuntu/Dev/ubiquity/tests/test_usersetup.py:6: PyGIWarning: UbiquityMockResolver was imported without specifying a version first. Use gi.require_version('UbiquityMockResolver', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import UbiquityMockResolver
Traceback (most recent call last):
  File "/home/j-lallement/shared/Ubuntu/Dev/ubiquity/./tests/run", line 121, in <module>
    suite = unittest.TestLoader().loadTestsFromNames(tests)
  File "/usr/lib/python3.9/unittest/loader.py", line 220, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib/python3.9/unittest/loader.py", line 220, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib/python3.9/unittest/loader.py", line 154, in loadTestsFromName
    module = __import__(module_name)
  File "/home/j-lallement/shared/Ubuntu/Dev/ubiquity/tests/test_usersetup.py", line 9, in <module>
    from ubiquity import gtkwidgets, plugin_manager
  File "/home/j-lallement/shared/Ubuntu/Dev/ubiquity/./ubiquity/gtkwidgets.py", line 38, in <module>
    class StylizedFrame(Gtk.Alignment):
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 32, in __getattr__
    return getattr(self._introspection_module, name)
  File "/usr/lib/python3/dist-packages/gi/module.py", line 123, in __getattr__
    raise AttributeError("%r object has no attribute %r" % (
AttributeError: 'gi.repository.Gtk' object has no attribute 'Alignment'

It should be fixed by setting the version of GTK to 3

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubiquity - 21.10.5

---------------
ubiquity (21.10.5) impish; urgency=medium

  * tests/test_gtkwidgets.py, ubiquity/frontend/gtk_ui.py:
    - use gi.require_version to ensure we import the right gtk bindings
      (lp: #1936488)

 -- Sebastien Bacher <email address hidden> Fri, 16 Jul 2021 16:03:27 +0200