Upgrade to Ubuntu 20.04

Solution 1:

I had a similar problem with doing an upgrade from 18.04 LTS to 20.04 LTS.

I had to remove the broken packages listed in /var/log/dist-upgrade/[CURRENT_DATE]/apt.log

list broken packages:

grep Broken /var/log/dist-upgrade/[CURRENT_DATE]/apt.log

Then remove each of those broken packages:

apt remove gsettings-desktop-schemas mutter gir1.2-mutter-6

It might require removing other packages that depend on those.