Broken packages prevent me from using boot-repair - What should I do?

[mahesh]

Hey,

I have an Ubuntu 20.04 LTS installation.
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uname --a
    Linux *** 5.13.0-40-generic #45~20.04.1-Ubuntu SMP Mon Apr 4 09:38:31 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
I need to update the boot manager.

So I tried to use boot-repair (from a live CD), which get me good results in the past.

This time I run into a problem that I procrastinate for some time now, but now I cannot ignore it anymore (although I've tried).

The output from the first of the manual steps of the boot-repair "process":

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ubuntu@ubuntu:~$ sudo chroot "/mnt/boot-sav/nvme0n1p3" dpkg --configure -a

Setting up libgl1-amdgpu-mesa-dri:amd64 (1:20.1.0-1109583) ...
dpkg: error processing package libgl1-amdgpu-mesa-dri:amd64 (--configure):
 installed libgl1-amdgpu-mesa-dri:amd64 package post-installation script subprocess returned error exit status 1
Setting up libgl1-amdgpu-mesa-dri:i386 (1:20.1.0-1109583) ...
dpkg: error processing package libgl1-amdgpu-mesa-dri:i386 (--configure):
 installed libgl1-amdgpu-mesa-dri:i386 package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 libgl1-amdgpu-mesa-dri:amd64
 libgl1-amdgpu-mesa-dri:i386
I get such an error message at the end of every installation, but the installations are nonetheless successful usually.
It looks like this:

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Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.7) ...
Errors were encountered while processing:
 libgl1-amdgpu-mesa-dri:amd64
 libgl1-amdgpu-mesa-dri:i386
E: Sub-process /usr/bin/dpkg returned an error code (1)
But, as I said, usually, the installations are successful nonetheless.

But boot-repair cannot go on with it.

Information about broken packages (commands copied from askubuntu.com) from the 20.04 LTS:

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dpkg -l | grep ^..r
   # returns nothing

dpkg-query -W -f='${db:Status-Abbrev} ${binary:Package}\n' | grep -E ^.[^nci]
    # returns
    iF  libgl1-amdgpu-mesa-dri:amd64
    iF  libgl1-amdgpu-mesa-dri:i386
I don't remember exactly whether I've tried to install a special amd driver or what else I've done to produce this error.

I searched the web for solutions, but I am a bit afraid of just copying "force"-commands. I've naively destroyed a Pop! OS installation with this before.

So I rather ask you, what I should do about it?

Thank you for your patients, time and effort <3
Andreas