[Bug 1920008] Re: grub2-signed depends on grub2-common

[Dimitri John Ledkov]

In xenial chroot, without proposed, installed grub-efi-amd64-signed

# dpkg-query -W | grep grub
grub-common	2.02~beta2-36ubuntu3.29
grub-efi-amd64	2.02~beta2-36ubuntu3.29
grub-efi-amd64-bin	2.02~beta2-36ubuntu3.29
grub-efi-amd64-signed	1.66.29+2.02~beta2-36ubuntu3.29
grub2-common	2.02~beta2-36ubuntu3.29

Enable -proposed, and try to install grub-efi-amd64-signed, alone (no
full-upgrade)

# apt install grub-efi-amd64-signed
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  grub-common grub-efi-amd64 grub-efi-amd64-bin grub2-common
Suggested packages:
  multiboot-doc grub-emu xorriso desktop-base console-setup
Recommended packages:
  os-prober secureboot-db
The following packages will be upgraded:
  grub-common grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub2-common
5 upgraded, 0 newly installed, 0 to remove and 82 not upgraded.
Need to get 3473 kB of archives.
After this operation, 6041 kB of additional disk space will be used.
Do you want to continue? [Y/n]

The new grub2-common is pulled in. Horay.

Test that grub utils work with one grub

$ grub-mkimage --verbose -O x86_64-efi -o foo
...
lots of text

The image is successfully created.

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

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https://bugs.launchpad.net/bugs/1920008

Title:
  grub2-signed depends on grub2-common

Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2-signed source package in Xenial:
  Fix Committed
Status in grub2-signed source package in Bionic:
  Fix Committed
Status in grub2-signed source package in Focal:
  Fix Committed
Status in grub2-signed source package in Groovy:
  Fix Committed

Bug description:
  [Impact]

   * one-grub has loosed the dependencies between src:grub2-signed and
  src:grub2, specifically grub2-common. However the modules in grub
  modules built by src:grbu2-unsigned require a high enough version of
  grub2-common with support for R_X86_64_PLT32 relocations. Generate
  depends that are high enough, for older releases.

  Otherwise users that have grub-efi-amd64-signed installed may get
  errors upon trying to configure the package from `grub-install` unable
  to handle unknown relocation.

  [Test Plan]

   * Disable -proposed

   * Install grub-efi-amd64-signed

   * Enable -proposed

   * Install grub-efi-amd64-signed (again)

   * Observe that not only grub-efi-amd64-signed is upgraded, but also
  that new version of grub2-common are upgraded too, on bionic and
  earlier series.

  
  [Where problems could occur]

   * As one-grub evolves, similar dep updates may be required in the
  future again. Thus every one-grub update should be tested across all
  releases prior to upload into -proposed.

  [Other Info]
   
   * This bug also reported at https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1917509

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