Upgrade from Daedalus went well aside from having to apt remove libvirt-daemon
to let apt-get dist-upgrade continue

However I assume I was using wayland before without knowing but with either
nouveau or the nvidia-driver even in modesetting mode then my second display
would on most boots connect and disconnect constantly. Switching to plasmaX11
fixed it.

Also why hasn't Debian got proper maintained instructions for getting a mok
signed nvidia-driver working. They just point you to some general module signing
instructions. The year of the linux desktop is years away just on this point alone.