[Bug 1896755] Re: Backport snap-preseed work from groovy to focal

[Dimitri John Ledkov]

Awaiting on cpc.

** Tags added: block-proposed-focal

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Title:
  Backport snap-preseed work from groovy to focal

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

Bug description:
  [Impact]

   * livecd-rootfs when building classic images with snaps preseeded
  doesn't perform any first-boot tasks during image building. It means
  fist boot is computationally intensive. In groovy, livecd-rootfs
  gained ability to precompute snap seeding, apparmor profiles making
  first boot snap seeding a lot faster. Backport the goodies.

  [Test Case]

   * Perform stock build of ubuntu-cpc lxd or qcow cloud image

   * Boot and observe they complete boot, and perfrom snap seeding very
  quickly (i.e. less than a couple of seconds)

  [Regression Potential]

   * Images might fail to build, or be missbuilt. However, these changes
  have been tested on groovy with the same snapd across all SKUs. Thus
  only groovy-vs-focal incompatibilities may arise.

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