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

[Dimitri John Ledkov]

Public bug reported:

[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.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: Fix Committed

** Affects: livecd-rootfs (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Affects: livecd-rootfs (Ubuntu Hirsute)
     Importance: Undecided
         Status: Fix Committed

** Also affects: livecd-rootfs (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Hirsute)
       Status: New => Fix Committed

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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 Committed
Status in livecd-rootfs source package in Groovy:
  New
Status in livecd-rootfs source package in Hirsute:
  Fix Committed

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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