I am running Ubuntu from a live session in order to see if I can reproduce this bug. Since though I'm still supposed to get stuff done, I'm trying to also do that. As a result I have to log onto corporate resources, and lock my screen while I'm not at my desktop.
I set a password on the default ubuntu/999 user account, but Ctrl-Alt-L still does not lock the screen, it merely blacks out the monitor.
How can I have a proper screen lock? Maybe I should just install