[Bug 1983003] Re: (focal) crashed due to _tryMarkObsoleteForRemoval failed for 'libpackagekit-glib2-18'

[Launchpad Bug Tracker]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1983003

Title:
  (focal) crashed due to _tryMarkObsoleteForRemoval failed for
  'libpackagekit-glib2-18'

Status in ubuntu-release-upgrader package in Ubuntu:
  Expired

Bug description:
  Running `sudo do-release-upgrade --mode=server` from Ubuntu 20.04 to
  Ubuntu 22.04 failed during the `Searching for obsolete software`.

  Viewing `/var/log/dist-upgrade/main.log` (see attached) shows that
  when an exception is raised by the `pkg.mark_delete()` from
  `self.restore_snapshot()`, the exception handler also calls
  `self.restore_snapshot()` and `pkg.mark_delete()`, which crashes `do-
  release-upgrade`.

  It failed at:

  ```
  DEBUG Start checking for obsolete pkgs
  ... <removed for brevity, see attachment for full logs>
  DEBUG package 'libpackagekit-glib2-18' produces an unwanted removal 'update-manager', skipping
  WARNING _tryMarkObsoleteForRemoval failed for 'libpackagekit-glib2-18' (Error('E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'): E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
  ERROR not handled exception:
    ...<removed for brevity, see attachment for full logs>
  ```

  Attached is my `/var/log/dist-upgrade/main.log`.

  I tried to report the bug via `apport` following the instructions in
  https://help.ubuntu.com/community/ReportingBugs, but both `apport-cli`
  and `apport-gtk` seemed to do nothing. I tried checking the Ubuntu
  error tracker with my `/var/lib/whoopsie/whoopsie-id` and nothing
  seems to be uploaded too (maybe I need to open an apport-cli/whoopsie
  bug too), so I decided to make a launchpad bug instead.

  Potentially useful notes for the device:
    - It's originally had Ubuntu 18.04 desktop, before upgrading to Ubuntu 20.04, and I removed a bunch of desktop packages once it became a server.

  1) `lsb_release -rd` shows `Release:	22.04` (was 20.04.1 before the upgrade)
  2) `apt-cache policy ubuntu-release-upgrader-core` shows `Installed: 1:22.04.12` but according to my `/apt/log/apt/history`, my previously installed version was `1:20.04.38`.
  3) I expected the upgrade to succeed successfully
     If it failed, I would at least expect an error message (or otherwise graceful exit)
  4) Crashed with no obvious error, unhanded python exception can only be seen in logfile.

    Not a major issue since my system still works and `sudo apt autoremove` removed most of those 
    files anyway.

  ---
  Useful excerpt from my `_usr_bin_do-release-upgrade.0.crash` file

  PythonArgs: ['/usr/bin/do-release-upgrade', '--mode=server', '--frontend=DistUpgradeViewText']
  Traceback:
   Traceback (most recent call last):
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeCache.py", line 992, in tryMarkObsoleteForRemoval
       self.restore_snapshot()
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeCache.py", line 370, in restore_snapshot
       pkg.mark_delete()
     File "/usr/lib/python3/dist-packages/apt/package.py", line 1524, in mark_delete
   apt_pkg.Error: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
   
   During handling of the above exception, another exception occurred:
   
   Traceback (most recent call last):
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/jammy", line 8, in <module>
       sys.exit(main())
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeMain.py", line 241, in main
       if app.run():
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeController.py", line 2042, in run
       return self.fullUpgrade()
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeController.py", line 2018, in fullUpgrade
       self.doPostUpgrade()
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeController.py", line 1467, in doPostUpgrade
       if not self.cache.tryMarkObsoleteForRemoval(pkgname, remove_candidates, self.forced_obsoletes, self.foreign_pkgs):
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeCache.py", line 243, in wrapper
       res = f(*args, **kwargs)
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeCache.py", line 996, in tryMarkObsoleteForRemoval
       self.restore_snapshot()
     File "/tmp/ubuntu-release-upgrader-ankkoy9i/DistUpgrade/DistUpgradeCache.py", line 370, in restore_snapshot
       pkg.mark_delete()
     File "/usr/lib/python3/dist-packages/apt/package.py", line 1524, in mark_delete
   apt_pkg.Error: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
  UserGroups: N/A
  _LogindSession: 4
  ProblemType: Crash
  Date: Thu Jul 28 04:03:55 2022
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.12
  Tags: dist-upgrade

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