[Bug 1952093] Update Released

[Brian Murray]

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/1952093

Title:
  Seeded snaps broken in the Focal dailies

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Focal:
  Fix Released

Bug description:
  [impact]
  In the recent focal-live-server-amd64 dailies, e.g. in:

  Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20211124)

  some snap related errors are printed to the terminal at boot time, and
  then subiquity doesn't start. Jumping to tty2 and doing a simple

    systemctl status snapd

  shows that snapd complains about the state of the core18 snap, and
  indeed /snap/core18/current/ is empty. Reinstalling core18 and
  refreshing subiquity from the candidate channel makes it start
  normally. This looks like a problem in the snap seeding.

  This turns out to be because the core18_*.snap file is missing from
  the live layer, thanks to some over enthusiastic cleanup in a livecd-
  rootfs hook.

  [test case]
  build a focal live-server iso with livecd-rootfs. check it boots.

  [regression potential]
  the fix touches a hook that only runs for live-server builds, so even if buggy it can't really make things worse (as current ISOs are basically inoperable)

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