At power-up, the greeter window provides for each of my 4 login ID's these desktops: Gnome, Gnome Classic, Ubuntu, Ubuntu w/ Wayland, MATE, Budgie, KDE/Plasma, and a few others.
Something about the MATE desktop is broken to the extent all I get is a background image and a moving mouse cursor.
No clicking or keystrokes (shy of ctrl-alt-F1, which brings up a console login) do anything.
What is the suggested way to repair MATE? Thx.