[Bug 1874834] Autopkgtest regression report (livecd-rootfs/2.408.59)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted livecd-rootfs (2.408.59) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

ubuntu-image/1.9+16.04ubuntu1 (ppc64el)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/xenial/update_excuses.html#livecd-rootfs

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1874834

Title:
  Xenial builds with core18-based snaps pre-seed core snap instead

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * A xenial image that preseeds a snap based on core18 will
     end up with core instead and preseeding on boot will fail.

  
  [Test Case]

   * Add a binary hook that pre-seeds lxd (which recently moved to a
     core18 base).  Ensure the snapd and core18 are pulled in by the
     build and core is not present.  Boot the image and ensure
     pre-seeding is successful.

  [Regression Potential]

   * Images with pre-seeded snaps regress in some fashion.  We will need
     to check these builds but there are no pre-seeded snaps in the
     livecd-rootfs tree for Xenial so this is a low risk change.

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