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

[Alexander Browne]

Ken Vandine replied (https://forum.snapcraft.io/t/gtk-common-themes-out-
of-date/29857/8): "It should have updated the tracking channel unless
you had perhaps switched to edge or candidate in the past then back to
stable."

Sounds like this needs some testing to confirm, since several users
don't remember changing the channel.

I'd also suggest that if someone has, there should be an option during
the upgrade — similar what happens when there’s a new system config file
that conflicts with your modified one.

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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  out-of-date/29857/

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