[Bug 1901906] Re: amd64 images should have correct set of bootloaders installed

[Joshua Powers]

The regression that was previously seen with the SRU is now fixed [1]
and therefore I am marking this as verification-done-xenial.

[1]
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-xenial/xenial/amd64/l/livecd-
rootfs/20210112_234252_88c0d@/log.gz

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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https://bugs.launchpad.net/bugs/1901906

Title:
  amd64 images should have correct set of bootloaders installed

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

Bug description:
  [Impact]

   * amd64 images should have shim-signed & grub-pc installed as the
  bootloaders, with all other alternatives not installed; and not
  partially removed (rc state). This is the only way to ensure that
  secureboot/efi boot works correctly, but also for BIOS grub-pc to work
  correctly. This is how we install systems by default today.

  [Test Case]

   * Build images; check that shim-signed & grub-pc are installed and configured
   * Check that no other packages are autoremovable or partially removed (rc)

  [Regression Potential]

   * The above changes gurantee that upon upgrades / dist-upgrade the
  correct set of bootloaders are installed. There will be a change of
  debconf keys and bootloader packages that are installed on the system,
  when comparing with a previous image, which some automation may be
  sensitive to if they were trying to automatically correct bootloader
  setup before.

  [Other Info]
   
   * Uploaded into hirsute already.

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