[Bug 1986346] Re: upgrade to 22.04.1 failed - AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

[Brian Murray]

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

** This bug has been marked a duplicate of bug 1969786
   Upgrade from 20.04 to 22.04 failed

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https://bugs.launchpad.net/bugs/1986346

Title:
  upgrade to 22.04.1 failed - AttributeError: 'DistUpgradeController'
  object has no attribute 'tasks'

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

Bug description:

  sudo dist-upgrade fails while installing packages :- don't know if
  system is now broken, or how to complete the upgrade. this is pretty
  horrible.

  Calculating the changes

  Calculating the changes

  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-tm0grze3/jammy", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeMain.py", line 241, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeController.py", line 2042, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeController.py", line 1991, in fullUpgrade
      if not self.calcDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeController.py", line 1100, in calcDistUpgrade
      if not self.cache.installTasks(self.tasks):
  AttributeError: 'DistUpgradeController' object has no attribute 'tasks'
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/problem_report.py", line 477, in add_to_existing
      self.write(f)
    File "/usr/lib/python3/dist-packages/problem_report.py", line 430, in write
      block = f.read(1048576)
    File "/usr/lib/python3.8/codecs.py", line 322, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

  Original exception was:
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-tm0grze3/jammy", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeMain.py", line 241, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeController.py", line 2042, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeController.py", line 1991, in fullUpgrade
      if not self.calcDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-tm0grze3/DistUpgrade/DistUpgradeController.py", line 1100, in calcDistUpgrade
      if not self.cache.installTasks(self.tasks):
  AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

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