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

[Steve Langasek]

Xenial: server install from ubuntu-16.04.7-server-amd64.iso. Security
updates applied by d-i, including grub-efi-amd64 2.04-1ubuntu44.
/etc/kernel/post{inst,rm}.d/zz-update-grub are not present, as with
bionic.

grub-pc is not installed.

Enabled -proposed in sources.list.

sudo apt install grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed

/etc/kernel/post{inst,rm}.d/zz-update-grub now exist as expected

sudo apt dist-upgrade to install 4.4.0-210-generic kernel from xenial-
proposed (along with other random bits)

Inspecting /boot/grub/grub.cfg shows references to -210-.

Rebooting, and uname shows -210- is booted.

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

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

Status in grub2 package in Ubuntu:
  In Progress
Status in grub2-signed package in Ubuntu:
  Invalid
Status in grub2-unsigned package in Ubuntu:
  Invalid
Status in grub2 source package in Trusty:
  Invalid
Status in grub2-signed source package in Trusty:
  New
Status in grub2-unsigned source package in Trusty:
  Triaged
Status in grub2 source package in Xenial:
  Invalid
Status in grub2-signed source package in Xenial:
  Fix Committed
Status in grub2-unsigned source package in Xenial:
  Fix Committed
Status in grub2 source package in Bionic:
  Invalid
Status in grub2-signed source package in Bionic:
  Fix Committed
Status in grub2-unsigned source package in Bionic:
  Fix Committed
Status in grub2 source package in Focal:
  Fix Committed
Status in grub2-signed source package in Focal:
  Fix Committed
Status in grub2-unsigned source package in Focal:
  Fix Committed
Status in grub2 source package in Groovy:
  Won't Fix
Status in grub2-signed source package in Groovy:
  Fix Committed
Status in grub2-unsigned source package in Groovy:
  Fix Committed

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 grub packages from -updates
   * ensure that /etc/kernel/post{inst,rm}.d/zz-update-grub are absent; if necessary, remove them
   * 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
   * From bionic, verify that a dist-upgrade to focal works without conflicts.

  [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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