[Bug 1975533] Please test proposed package

[Robie Basak]

Hello Brian, or anyone else affected,

Accepted ubuntu-release-upgrader into impish-proposed. The package will
build now and be available at
https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:21.10.10
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-
impish to verification-done-impish. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-impish. 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.

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https://bugs.launchpad.net/bugs/1975533

Title:
  No longer possible to use do-release-upgrade on Groovy

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid
Status in ubuntu-release-upgrader source package in Impish:
  Fix Committed
Status in ubuntu-release-upgrader source package in Jammy:
  Triaged

Bug description:
  Impact
  ------
  It is not possible for users still running Ubuntu 20.10, an end of life release, to upgrade to a supported release of Ubuntu.

  Test Case
  ---------
  On an Ubuntu 20.10 run `do-release-upgrade` and observe an error message about "an upgrade from Groovy to Impish is not supported".

  With the version of ubuntu-release-upgrader from -proposed (accessible
  by running `do-release-upgrade -p`) the upgrade will be supported and
  complete successfully.

  Regression Potential
  --------------------
  Its possible that the upgrade process could fail and users will be left with a broken system instead of an insecure one. However, we'll test upgrading a standard install of Ubuntu desktop to ensure the process works.

  SRU Note
  --------
  This'll also need fixing in Jammy so people still running Groovy could upgrade to it when Impish reaches its EoL, however that isn't really testable yet so will be fixed in Jammy later.

  Original Description
  --------------------
  I tried running `do-release-upgrade` on an Ubuntu 20.10 (Groovy Gorilla) system and received an error message from dist-upgrader tarball that an upgrade from Groovy to Impish is not supported. This is because DistUpgrade.cfg (distributed by the tarball) contains `From=Hirsute` and `To=Impish`.

  A minimal fix for this would be to create a DistUpgrade.cfg.groovy and
  ensure `From=Groovy`. You'd want to look at the contents of
  DistUpgrade.cfg and DistUpgrade.cfg.focal to sort out what
  DistUpgrade.cfg.groovy should contain. We might also want to create a
  new demoted.cfg file but the demoted.cfg.focal file might capture
  everything that was demoted. (For what its worth I tested an upgrade
  of a stock Ubuntu 20.10 system to Ubuntu 21.10 by copying
  DistUpgrade.cfg.focal to DistUpgrade.cfg.groovy and did not run into
  any issues.

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