Alright, I'm running the latest version of Lubuntu on my system, Lubuntu 14, and some strange things have been happening when trying to set up a lock screen.
Since I use a laptop, all I want to do is make it so that the system asks for a password if I 1.) Hit the windows key + L, 2.) manually lock the screen, or 3.) fold the laptop. I've tried doing this all through the light locker settings in the preferences category.
However, whenever I set the option, other things happen.
First, while I was successful in being able to lock my screen through the log-out prompt, after I get done doing the other tasks the computer display won't turn back on. The power button is still glowing, but I have to do a forced shut-down since no keyboard input affects anything.
Secondly, in response to that, I went back to light locker settings and disabled the shut-off display option, but then when I tried locking the screen again, the computer shut off on its own.
So what's going on here? Again, my only desires are a password prompt under the conditions listed above.
NOTE: I've discovered that if I close the lid for a prolonged time, it'll then go into the lock screen as I desire. I don't know why, though. The time it takes seems arbitrary, for if I leave the lid down for a few seconds the lock-screen won't activate. It's most desirable for me to be able to do it immediately on command.