[Bug 1999812] Re: Upgrade from 20.04 to 22.04 failed: Unhandled exception: AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

[Nick Rosbrook]

*** This bug is a duplicate of bug 1969786 ***
    https://bugs.launchpad.net/bugs/1969786

Marking as a duplicate of 1969786. This still has not been fixed in
Jammy, because we need a reproducer for an SRU. Maybe these logs can
help with that.

** This bug has been marked a duplicate of bug 1969786
   Upgrade from 20.04 to 22.04 failed: AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

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https://bugs.launchpad.net/bugs/1999812

Title:
  Upgrade from 20.04 to 22.04 failed: Unhandled exception:
  AttributeError: 'DistUpgradeController' object has no attribute
  'tasks'

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

Bug description:
  Hi,

  One of my older machines experienced an error when upgrading from
  Xubuntu 20.04.5 to 22.04.1

  In the tail of /var/log/dist-upgrade/main.log I see:

  2022-12-15 18:20:59,402 ERROR not handled exception:
  Traceback (most recent call last):

    File "/tmp/ubuntu-release-upgrader-5gqd3nds/jammy", line 8, in <module>
      sys.exit(main())

    File "/tmp/ubuntu-release-upgrader-5gqd3nds/DistUpgrade/DistUpgradeMain.py", line 241, in main
      if app.run():

    File "/tmp/ubuntu-release-upgrader-5gqd3nds/DistUpgrade/DistUpgradeController.py", line 2042, in run
      return self.fullUpgrade()

    File "/tmp/ubuntu-release-upgrader-5gqd3nds/DistUpgrade/DistUpgradeController.py", line 1991, in fullUpgrade
      if not self.calcDistUpgrade():

    File "/tmp/ubuntu-release-upgrader-5gqd3nds/DistUpgrade/DistUpgradeController.py", line 1100, in calcDistUpgrade
      if not self.cache.installTasks(self.tasks):

  AttributeError: 'DistUpgradeController' object has no attribute
  'tasks'

  2022-12-15 18:20:59,402 DEBUG running apport_crash()

  I believe this error has been reported before and was said to be fixed
  in bug report: 1969786

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:22.04.15
  ProcVersionSignature: Ubuntu 5.4.0-135.152-generic 5.4.212
  Uname: Linux 5.4.0-135-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.25
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CrashReports:
   640:0:127:2150710:2022-12-15 18:21:05.586576824 +0100:2022-12-15 18:36:17.623828781 +0100:/var/crash/_usr_bin_do-release-upgrade.0.crash
   644:0:127:0:2022-12-15 18:21:05.586576824 +0100:2022-12-15 18:35:52.023460264 +0100:/var/crash/_usr_bin_do-release-upgrade.0.upload
  CurrentDesktop: XFCE
  Date: Thu Dec 15 18:59:00 2022
  InstallationDate: Installed on 2020-05-02 (957 days ago)
  InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2022-12-15 (0 days ago)
  VarLogDistupgradeTermlog:

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