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

[Francis Ginther]

** Tags added: id-5ea1fbea27934b1badeb6f2b

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

Status in livecd-rootfs package in Ubuntu:
  New

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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