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

[Alexander Browne]

Public bug reported:

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/

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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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  out-of-date/29857/

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