[Bug 1913476] Re: /usr/bin/update-manager:TypeError:/usr/bin/update-manager at 118:start_update:start_available:refresh_cache:update:_make_groups:__contains__

[William Wilson]

Traceback (most recent call last):
  File "/usr/bin/update-manager", line 118, in <module>
    app.start_update()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 220, in start_update
    self.start_available()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 238, in start_available
    self.refresh_cache()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 435, in refresh_cache
    duplicate_packages=self.duplicate_packages)
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py", line 531, in update
    eventloop_callback)
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py", line 444, in _make_groups
    if pkg in cache:
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 350, in __contains__
    return self.__is_real_pkg(self._cache[key])
TypeError: Expected a string or a pair of strings


This is due to apt.package.Package objects being added to a list of
strings.

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https://bugs.launchpad.net/bugs/1913476

Title:
  /usr/bin/update-manager:TypeError:/usr/bin/update-
  manager at 118:start_update:start_available:refresh_cache:update:_make_groups:__contains__

Status in update-manager package in Ubuntu:
  New

Bug description:
  The Ubuntu Error Tracker has been receiving reports about a problem regarding update-manager.  This problem was most recently seen with package version 1:20.04.10.3, the problem page at https://errors.ubuntu.com/problem/b4e18d21aa7526e3a98130b1556e4d38ffaff9e0 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

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