[Mashiro]

What happens if you use a online generator for a sources.list file for Debian/Ubuntu and you select the wrong release... I assume since his server says Buster he did perform a apt-get update and apt-get upgrade after installing the wrong sources already and that probably went through as I mentioned before. What happens is that you wrongfully update all your packages of the one from the wrong release. This can break pretty much everything.

I still stand with a reinstallation to a clean system and this time if anyone plays around with the sources.list file... MAKE SURE you use the right release name/version of your Debian/Ubuntu installation.