I have a regular ubuntu installation which I then installed xubuntu desktop over. I am occasionally confounded though by an unknown "screen locker" that occasionally appears instead of my normal locker. For example, when my screen saver comes on, and I move the mouse, I am confronted with the following (notice there's a switch user and unlock button):
On the other hand, occasionally (about 1 in 5 times - the other times I get a 'normal' box), especially after "suspending" (by closing the lid), and waking up the computer, I am confronted with the following:
note the red border on the password box, and the lack of a 'switch user' button.
When I have the second box I am unable to unlock the computer. No matter what password I use, my user password, etc. it will just not unlock. I have to go to a console (Ctrl-Alt-1) and then reboot the computer.
In the past, from the console, I have killed all processes with "screen" in the name, nothing helps.
What is this "broken" locker (so I an identify and remove it)? Which password does it expect (there is no root password, I am the only user on the machine - I have sudo access).
Any thoughts/insights appreciated.