[Bug 1928674] Re: grub-efi-amd64 from grub2-unsigned has lost kernel/postinst.d script

[Dimitri John Ledkov]

How can you introduce conffiles in grub-efi-amd64 & grub-efi-arm64 which
is shared across releases? If in later series they have been removed
from said package. That will cause a mess in focal+ then, since it will
conflict with grub2-common there.

Given that the future is for these conffiles to live in grub2-common, it
might be easier to backport the move from grub-{platform} to
grub2-common.

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Title:
  grub-efi-amd64 from grub2-unsigned has lost kernel/postinst.d script

Status in grub2-unsigned package in Ubuntu:
  Fix Released
Status in grub2-unsigned source package in Trusty:
  Triaged
Status in grub2-unsigned source package in Xenial:
  Triaged
Status in grub2-unsigned source package in Bionic:
  Triaged

Bug description:
  [Impact]

   * /etc/kernel/{postinst.d,postrm.d}/zz-update-grub missing on arm64
  with grub-efi-arm64 (a dependency of grub-efi-arm64-signed) installed

   * /etc/kernel/{postinst.d,postrm.d}/zz-update-grub missing on amd64
  with grub-efi-amd64 (an ORed dependency of grub-efi-amd64-signed)
  installed.

   * This results in newly installed kernels not getting added to
  grub.cfg and thus upon reboot one does not boot into the new kernel.

   * In later series these scripts moved to grub2-common, which is why
  they are absent in the backported grub-efi-* packages.  They should be
  restored to these packages in the backport.

  [Test Plan]

   * Install new grubs

   * If testing on amd64 ensure that grub-efi-amd64 is installed, not
  grub-pc.

   * Install a new kernel that was not installed before

   * Observe that grub.cfg is regenerated and new kernel is present

   * Remove an old kernel

   * Observe that grub.cfg is regenerated and new kernel is removed from
  grub.cfg

  [Where problems could occur]

   * These are conffiles. Although nobody should modify them, care
  should be taken when moving conffiles around.

  [Other Info]

   * First reported by klebers

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