[Bug 1871822] Re: Update manager failure

[Marcus Tomlinson]

*** This bug is a duplicate of bug 1871490 ***
    https://bugs.launchpad.net/bugs/1871490

** This bug has been marked a duplicate of bug 1871490
   update-manager crashed with TypeError in update(): argument of type 'NoneType' is not iterable

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1871822

Title:
  Update manager failure

Status in Ubuntu MATE:
  New
Status in update-manager package in Ubuntu:
  New

Bug description:
    File "/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py", line 236, in _on_finished
      self._action_done(action,
    File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 269, in _action_done
      self.window_main.start_available(is_cancelled_update)
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 236, in start_available
      self.refresh_cache()
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 397, in refresh_cache
      self.update_list.update(self.cache, eventloop_callback=iterate,
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py", line 521, in update
      if (pkg.name in duplicate_packages):
  TypeError: argument of type 'NoneType' is not iterable

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py", line 244, in _on_finished
      self._action_done(action,
    File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 269, in _action_done
      self.window_main.start_available(is_cancelled_update)
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 236, in start_available
      self.refresh_cache()
    File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 397, in refresh_cache
      self.update_list.update(self.cache, eventloop_callback=iterate,
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py", line 521, in update
      if (pkg.name in duplicate_packages):
  TypeError: argument of type 'NoneType' is not iterable
  ^CTraceback (most recent call last):
    File "/usr/bin/update-manager", line 119, in <module>
      Gtk.main()
    File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 1632, in main
      return _Gtk_main(*args, **kwargs)
    File "/usr/lib/python3.8/contextlib.py", line 120, in __exit__
      next(self.gen)
    File "/usr/lib/python3/dist-packages/gi/_ossighelper.py", line 251, in register_sigint_fallback
      signal.default_int_handler(signal.SIGINT, None)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-mate/+bug/1871822/+subscriptions