[Bug 2048953] Re: grub fails to add boot entries if python3-apt is missing

[Dalton Durst]

Hi Julian, Mate,

I think adding python3-apt to the Depends of grub-common is a good
solution. This issue is not urgent and is easily worked around, so
waiting for the next upload is absolutely fine. Thank you!

As for how I got a system into this state... It never had python3-apt
installed. I built the system by running 'debootstrap --variant=minbase
noble noble http://archive.ubuntu.com/ubuntu gutsy' and added exactly
the packages I needed. I won't pretend that I've created a system that I
can go to libera.chat #ubuntu and ask for help with, but as in Debian,
the only packages that a binary control file can assume as installed are
those in the 'Priority: Required' set. I think it is worth keeping that
usecase available, and if you say that I need to do more work to keep it
that way I'm fine with putting in the effort.

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https://bugs.launchpad.net/bugs/2048953

Title:
  grub fails to add boot entries if python3-apt is missing

Status in grub2 package in Ubuntu:
  Triaged

Bug description:
  In mantic and noble, when update-grub is run without python3-apt
  installed, the following output is generated:

      Sourcing file `/etc/default/grub'
      Generating grub configuration file ...
      Traceback (most recent call last):
      File "/usr/lib/grub/grub-sort-version", line 4, in <module>
          import apt_pkg
      ModuleNotFoundError: No module named 'apt_pkg'
      Traceback (most recent call last):
      File "/usr/lib/grub/grub-sort-version", line 4, in <module>
          import apt_pkg
      ModuleNotFoundError: No module named 'apt_pkg'
      Traceback (most recent call last):
      File "/usr/lib/grub/grub-sort-version", line 4, in <module>
          import apt_pkg
      ModuleNotFoundError: No module named 'apt_pkg'
      Adding boot menu entry for UEFI Firmware Settings ...
      done

  When this occurs, no Linux boot options are added to the GRUB config.

  grub-sort-version was added to the grub-common binary package in
  2.12~rc1-10ubuntu2. It is a python script which sorts the kernel
  versions via Debian rules using apt_pkg. The grub package was updated
  to depend on python3 so this script could run. However, the script
  also depends on python3-apt.

  Either grub-sort-version should be changed not to depend on
  python3-apt (or fail gracefully when it's missing) or python3-apt
  should be added to the dependencies of grub-common.

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