[Bug 2036725] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for livecd-rootfs has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/2036725

Title:
  LXD snap not being installed from the right channel when running
  unminimize

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Jammy:
  Fix Released
Status in livecd-rootfs source package in Lunar:
  Fix Committed

Bug description:
  [Impact]
  ========

  There's a step in `unminimize` where it installs the LXD snap. The
  problem is that it doesn't mention any channel where to install it
  from. So often it happens that we have the LXD snap on 20.04 or 22.04
  from the latest/stable channel (as that's the default!).

  However, we should be installing this from stable/ubuntu-20.04 or
  stable/ubuntu-22.04 (or equivalent) channel.

  [Test Plan]
  ===========

  1. Create an image with the changes:
  $ ubuntu-bartender --build-provider gce --hook-extras-dir "$(pwd)/cpc_packaging.extra" --livecd-rootfs-branch ubuntu/jammy -- --series jammy --project ubuntu-cpc --image-target gce --subproject minimized

  2. Boot into that image. Ensure it's a minimized image.

  3. Run update and unminimize.
  # apt update
  # unminimize

  4. Check the snap list to see the right channel being used.
  # snap list | grep 'lxd' | awk '{print $4}'

  
  [Where Problems Could Occur]
  =============================

  There's very smol room for error especially when the patch only
  introduces the following to the snap install call:
  --channel="stable/ubuntu-$VERSION_ID"

  But things might behave differently IFF someone has tampered their
  /etc/os-release OR/AND fiddled with the unminimize script to do a
  different thing. :)

  [OG Bug Report]
  ===============

  In the past, when running unminimize, we'd directly do:
  snap install lxd
  (cf: https://git.launchpad.net/livecd-rootfs/tree/live-build/auto/build#n322)

  which defaults to the latest/stable channel. However, whilst working
  on enhancing unminimize, it was observed that we install this snap
  from the stable/ubuntu-<version> channel instead.

  This was also noted as a failure when running the CTF tests:
  `lxd installed from latest/stable, not stable/ubuntu-23.10`

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