I wanted to test the pantheon DE from unstable nixpgs. I got only a black screen after login. So I set my DE back to gnome3 (my previous
configuration.nix). However now gnome3 only shows me a white xterm in the upper left corner, no menus, no bars, nothing but this terminal.
configuration.nix is the same as it was before I tried pantheon.
I remember I got some “collision” warnings installing pantheon. What are these? Could this cause the problem?
Booting an old config from grub works. What can I do now?