[Bug 1928397] Re: ensure python is marked for removal when upgrading from 18.04 to 20.04

[Steve Langasek]

Hello Brian, or anyone else affected,

Accepted ubuntu-release-upgrader into focal-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/ubuntu-release-upgrader/1:20.04.33 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-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. 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 Focal)
       Status: In Progress => Fix Committed

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

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https://bugs.launchpad.net/bugs/1928397

Title:
  ensure python is marked for removal when upgrading from 18.04 to 20.04

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid
Status in ubuntu-release-upgrader source package in Focal:
  Fix Committed

Bug description:
  There are still a lot of bug reports where users cannot upgrade from
  Ubuntu 18.04 LTS to Ubuntu 20.40 LTS due to python still being kept
  when the problem resolver runs. This is due to a bit of code being
  removed when 20.04.31 was uploaded[1]. That code should be restored as
  it will allow more users to upgrade to Ubuntu 20.04 LTS.

  [Test Cases]
  1) lxc launch ubuntu:18.04
  2) Restore the apt-clone file from LP: #1927268
  3) Run do-release-upgrade
  4) Observe a failure to calculate the upgrade to Focal

  With the version of the release upgrader from -proposed (do-release-
  upgrade -p) the upgrade to Focal will be calculated successfully.

  [Where Problems Could Occur]
  This code previously existed in the release upgrader and just ensures that we are are moving python from the system. However, there could also be typos in the restored code but that would cause a Traceback when running the test case so that would get caught.

  [Other Info]
  That being said it would be good to get more testing of this version of the release upgrader so I'll look at recent bug reports where python is marked for keeping (MarkKeep python:amd64 < 2.7.15~rc1-1 @ii gR > FU=0) and ask those users to test the release upgrader from -proposed.

  [1] http://launchpadlibrarian.net/531097604/ubuntu-release-
  upgrader_1%3A20.04.30_1%3A20.04.31.diff.gz

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