[Bug 1874834] Re: Xenial builds with core18-based snaps pre-seed core snap instead

[Robert C Jennings]

I've looked at the ubuntu-image autopkgtest failure on ppc64el.  The
failure was a network timeout on a 'pip' command.  Re-running the test
has passed and this seems acceptable.  I will continue testing the SRU
per the testcase in the template and update this bug.

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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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