[Bug 1982055] Re: Ubuntu 21.04 is un-upgradeable

[Rob Thomas]

My immediate suggestion would be to only skip unsupported OSs if the
CURRENT OS is supported.

That would allow someone to upgrade from 20.10 (unsupported) -> 21.04
(unsupported) -> 21.10 (unsupported) -> 22.04 (supported) which would be
painful and annoying for the end user, but it would at least mean they
can catch up to what Canonical wants.

The code would then be something like:

  if this_dist.supported  and not dist.supported and not self.useDevelopmentRelease:
      continue

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https://bugs.launchpad.net/bugs/1982055

Title:
  Ubuntu 21.04 is un-upgradeable

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Related: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
  upgrader/+bug/1981939

  Any existing U21.04 machines are currently dead in the water, as there
  appears to be no way at all to upgrade them to 21.10 and then to
  22.04.

  For some reason 'do-release-upgrade' is trying to take them directly
  from 21.04 to 22.04 - is there some typo/regexp issue somewhere where
  it's thinking it's trying to move from 20.04 to 22.04?

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