@rolfie, take a look at this thread starting down about post #19, there is some info about your amdgpu issue, I had to not install it in the mate-mini or it would break completely. https://dev1galaxy.org/viewtopic.php?id=7389

Can that please be the last off-topic post in this thread that's supposed to be about display managers that work with both X and Wayland?

You are right, the xlibre stuff is sort of off-topic here. Please can you move that to e.g. https://dev1galaxy.org/viewtopic.php?id=7388?

I thought the doc is wrong and corrected my entry according to a correct deb822 syntax as used by Debian/Devuan where "Suites" stands for the release names and "Components" for main contrib ..... These "corrections" caused the release file issues.

When using your version, apt update works and my VM is getting the latest xlibre update. With one exception: xserver-xlibre-video-amdgpu. That is fixed when I run an

apt -t excalibur-backports install xserver-xlibre-video-amdgpu

Unfortunately, the VM is no more starting to the graphical display. I get a blinking cursor on a black screen, and a bar that might be something like a pattern from a text output where the pixels are not aligned. Same symptons I got with another test on Freia.