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

[Mikolaj Buchwald]

Hi, @Brian Murray, I tested the solution you suggested on a newly-
installed Ubuntu 20.10 Groovy, and it worked. I described the steps to
reproduce the problem, and the solution here:
https://gist.github.com/mikbuch/2c349e1281c69818b48893a460c5accb?permalink_comment_id=4206418#gistcomment-4206418

I also created a merge request
(https://code.launchpad.net/~mikbuch/ubuntu/+source/ubuntu-release-
upgrader/+git/ubuntu-release-upgrader/+merge/425341), but I didn't know
the patch version for the proper commit message. I am also not sure if I
should have committed directly to ubuntu/impish, or rather, e.g., to the
ubuntu/impish-devel. Hope that helps you somehow. Let me know if I could
do something more to help you.

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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
Status in ubuntu-release-upgrader source package in Impish:
  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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