[Bug 1971987] Re: On release upgrade, Snaps don't change channel

[Sebastien Bacher]

Since bug #1748581 was fixed the dist-upgrader is only changing the
channel if the currently set matches the release used, unsure how you
got stucked on stable/ubuntu-19.04 but that explain why it wouldn't
change it now. Did you upgrade use apt or some other way back then?

Doing a new 21.10 insllation and upgrading correctly result in the
channel to be updated so it seems likely the issue impact users which
for some reason are using a channel not matching the release they are
using

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https://bugs.launchpad.net/bugs/1971987

Title:
  On release upgrade, Snaps don't change channel

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

Bug description:
  Snaps need a way to have their channels transitioned on release
  upgrade, which doesn't seem to happen right now.

  A recent example is the gtk-common-themes snap. The stable channel
  version is not the latest because it can break earlier releases, so
  for Jammy the correct channel is stable/ubuntu-22.04. However, systems
  that were upgraded from a previous version are not transitioned to
  this channel, so they have the older snap from stable channel or from
  a previous versioned channel (e.g. stable/ubuntu-19.04).

  Mentioned first on https://discourse.ubuntu.com/t/known-issues-with-
  firefox-snap/24663/47

  Discussed further at https://forum.snapcraft.io/t/gtk-common-themes-
  out-of-date/29857/

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