Traceback (most recent call last):
  File "/usr/lib/ubiquity/plugins/ubi-language.py", line 464, in on_release_notes_link
    self.openURL(url)
  File "/usr/lib/ubiquity/plugins/ubi-language.py", line 477, in openURL
    drop_privileges_save()
  File "/usr/lib/ubiquity/ubiquity/misc.py", line 89, in drop_privileges_save
    assert _dropped_privileges is not None and _dropped_privileges > 0
AssertionError