Traceback (most recent call last):
  File "/usr/lib/ubuntu-release-upgrader/do-partial-upgrade", line 28, in <module>
    from gi.repository import Gtk
  File "<frozen importlib._bootstrap>", line 1564, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1531, in _find_and_load_unlocked
  File "/usr/lib/python3/dist-packages/gi/importer.py", line 68, in load_module
    dynamic_module._load()
  File "/usr/lib/python3/dist-packages/gi/module.py", line 291, in _load
    overrides_modules = __import__('gi.overrides', fromlist=[self._namespace])
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 1583, in <module>
    raise RuntimeError("Gtk couldn't be initialized")
RuntimeError: Gtk couldn't be initialized