[Bug 1965568] Re: missing dependency on python3-dbus

[Nick Rosbrook]

I have tested upgrade from Impish to Jammy using version 1:22.04.11
using the test plan above (and appending --proposed to do-release-
upgrade), and I have verified this issue is fixed.

** Tags removed: verification-needed-jammy
** Tags added: verification-done-jammy

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https://bugs.launchpad.net/bugs/1965568

Title:
  missing dependency on python3-dbus

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Jammy:
  Fix Committed
Status in ubuntu-release-upgrader source package in Kinetic:
  Fix Released

Bug description:
  [Impact]

  If a user does not have the python3-dbus package installed, the
  upgrade will fail trying to `import dbus`.

  [Test Plan]

  * On an Impish host, remove python3-dbus. Note that
  python3-distupgrade is NOT listed in the warning from dpkg.

    $ sudo dpkg -r --force-depends python3-dbus

  * Attempt an upgrade, and observe the "ModuleNotFoundError: No module
  named 'dbus'" exception.

    $ do-release-upgrade

  [Where problems could occur]

  The patch moves the `import dbus` statement to later in the code, so
  if another part of that source file needed the dbus module, exceptions
  would occur.

  [Original Description]

  When I try to execute `do-release-upgrade -d` on a 20.04 system, the
  following fatal error occured.

  Traceback (most recent call last):

  File "/tmp/ubuntu-release-upgrader-yqb1e837/jammy", line 8, in
  <module>
  sys.exit(main())

  File
  "/tmp/ubuntu-release-upgrader-yqb1e837/DistUpgrade/DistUpgradeMain.py",
  line 222, in main
  from .DistUpgradeController import DistUpgradeController

  File
  "/tmp/ubuntu-release-upgrader-yqb1e837/DistUpgrade/DistUpgradeController.py",
  line 25, in <module>
  import dbus

  ModuleNotFoundError: No module named 'dbus'

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