[Bug 1975533] Re: No longer possible to use do-release-upgrade on Groovy

[Mikolaj Buchwald]

@Brian Murray, first, thank you so much for confirming the issue and
creating this bug report.

Just to be clear, I finally was able to upgrade from groovy to impish by
following the instructions in this post:
https://blog.invid.eu/2022/02/24/upgrade-eol-ubuntu-server-
from-20-10-to-21-10-an-upgrade-from-groovy-to-impish-is-not-supported-
with-this-tool-ubuntu-ubuntugeek-ubuntu-linux-eol-upgrade/ ; see also
the official documentation:
https://help.ubuntu.com/community/EOLUpgrades

To the people new to this thread: see also my comment
(https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
upgrader/+bug/1745754/comments/6) in the other bug report:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
upgrader/+bug/1745754 ; and my notes on the issue:
https://gist.github.com/mikbuch/2c349e1281c69818b48893a460c5accb

@Brian Murray, your suggestion for the minimal fix is all OK, but I
wonder if a more general mechanism could be implemented, to support
upgrading from an EOL release X to a (EOL) release Y (as the `do-
release-upgrade` already says/recognizes with which release there was a
problem to which: "An upgrade from ‘groovy’ to ‘impish’ is not supported
with this tool."). I don't fully grasp how the DistUpgrade.cfg work,
maybe my issue is/was related only to groovy. Either way, if the current
bug will be resolved, maybe it is also good idea to update the
documentation on EOL upgrades, as well
(https://help.ubuntu.com/community/EOLUpgrades).

I can help, and I will, as soon as I will get more familiar with the
`do-release-upgrade` process.

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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:
  Confirmed

Bug 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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