I have a fairly stock Ubuntu 19.10 installation (gdm3, Gnome 3.34.2). On reboot (after the luks password screen) I just get a solid coloured screen but with no username or other content.
I can get to the proper login screen by switching virtual consoles (ctrl-alt-F2 and then back with ctrl-alt-F1). All is normal from that point.
It's a minor issue, but a bit annoying just the same. I think it started after I tested out the mate-desktop package, and then removed it. I had to remove a few other mate-*** packages, and something might have gone awry.
Anyone know how I can put the GDM login back to its original state?