Upgrade -> broken packages

I had problems with my upgrade to 20.04. I thought I fixed them, but I was wrong. When I try to install libopengl0 I get an error that libglvnd0 needs to be version 1.3.1-1 but version 1.3.2-1~ubuntu0.20.04.1 is installed.

Below are a few examples of what I have tried so far:

$ sudo apt-get update --fix-missing
[sudo] password for backlin: 
    
Retrieved 2010 kB in 2s (939 kB / s)
Reading package lists... Done
$ sudo dpkg --configure -a
$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded
$ sudo apt clean
$ sudo apt autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded

asked for by Steeldriver:

~$ apt policy libopengl0 libglvnd0
libopengl0:
  Installerad: (ingen)
  Kandidat:    1.3.1-1
  Versionstabell:
     1.3.1-1 500
        500 http://mirror.zetup.net/ubuntu focal/main amd64 Packages
libglvnd0:
  Installerad: 1.3.2-1~ubuntu0.20.04.1
  Kandidat:    1.3.2-1~ubuntu0.20.04.1
  Versionstabell:
 *** 1.3.2-1~ubuntu0.20.04.1 100
        100 /var/lib/dpkg/status
     1.3.1-1 500
        500 http://mirror.zetup.net/ubuntu focal/main amd64 Packages

Asked for by Ali E:

$ sudo apt install libglvnd0
[sudo] lösenord för backlin: 
Läser paketlistor… Färdig
Bygger beroendeträd       
Läser tillståndsinformation… Färdig
libglvnd0 is already the newest version (1.3.2-1~ubuntu0.20.04.1).
0 att uppgradera, 0 att nyinstallera, 0 att ta bort och 0 att inte uppgradera.

Asked for by Karel

$ sudo apt-get install libopengl0 -f
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libopengl0 : Depends: libglvnd0 (= 1.3.1-1) but 1.3.2-1~ubuntu0.20.04.1 is to be installed
E: Unable to correct problems, you have held broken packages.