I'm having broken packages / conflicts between Ubuntu and Debian. In particular, Thunderbird and Perl cannot be updated.

For Perl, I get something like

$ sudo apt upgrade perl

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Calculating upgrade... 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 resolve the situation:



The following packages have unmet dependencies:

 libclass-xsaccessor-perl : Depends: perl (< 5.30.1~) but 5.32.1-4+deb11u1 is to be installed

 libcommon-sense-perl : Depends: perl (< 5.30.1~) but 5.32.1-4+deb11u1 is to be installed

 perl : Depends: perl-base (= 5.32.1-4+deb11u1) but 5.30.0-9ubuntu0.2 is to be installed

        Depends: perl-modules-5.32 (>= 5.32.1-4+deb11u1) but it is not going to be installed

        Depends: libperl5.32 (= 5.32.1-4+deb11u1) but it is not going to be installed

My PPA list should be reasonable, in sources.list.d/:

debian.list

dropbox.list

graphics:darktable.list

graphics-drivers-ubuntu-ppa-focal.list

jonaski-ubuntu-strawberry-focal.list

nodesource.list

sbt.list

spotify.list

and here is the content of debian.list

deb http://ftp.debian.org/debian bullseye main

deb http://ftp.debian.org/debian bullseye-updates main

deb http://security.debian.org bullseye-security main

Any idea how to fix it, barring a reinstall? (which I would love to postpone until 22.04)