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

[Łukasz Zemczak]

Hello Zhang, or anyone else affected,

Accepted ubuntu-release-upgrader into jammy-proposed. The package will
build now and be available at
https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:22.04.11
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: ubuntu-release-upgrader (Ubuntu Jammy)
       Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-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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