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

[Alexey Kulik]

Here is my /var/log/dist-upgrade/main.log.
After upgrade from 21.10 to 22.04, gtk-common-themes snap was on latest/stable/ubuntu-19.04 channel.

** Attachment added: "main.log"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1971987/+attachment/5589325/+files/main.log

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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:
  Incomplete

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  out-of-date/29857/

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