Public bug reported:
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.
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: rls-ii-incoming
** Tags added: rls-ii-incoming
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https://bugs.launchpad.net/bugs/1975533
Title:
No longer possible to use do-release-upgrade on Groovy
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