Here's the Traceback:

Traceback (most recent call last):
  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 
319, in _action_done
    self.window_main.duplicate_packages = self.get_deb2snap_dups()
  File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 
125, in get_deb2snap_dups
    if (deb in cache and cache[deb].is_installed):
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 
319, in _action_done
    self.window_main.duplicate_packages = self.get_deb2snap_dups()
  File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 
125, in get_deb2snap_dups
    if (deb in cache and cache[deb].is_installed):
TypeError: argument of type 'NoneType' is not iterable

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https://bugs.launchpad.net/bugs/1880987

Title:
  /usr/bin/update-
  
manager:TypeError:_on_finished:_action_done:get_deb2snap_dups:_on_finished:_action_done:get_deb2snap_dups

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