The problem step by step:

1. After booting up I can login and start up some applications (firefox, xterm, 
etc.)
2. I Change the user by clicking the switch off button (up-right corner on the 
upper panel) and select an other name
3. I find my self on a gdm login window where the selected user's password has 
to be typed
4. After typing the password gnome-session starts and I can use this user's 
desktop.
5. After launching some applications (firefox, image viewer, etc.) I choose log 
out from this user which should result in a return of the previous user (or to 
the locked screen) but a blank screen appears. With the latest updates I do not 
get any text massage or similar just a black screen with the pointer I can move 
around but I can not do anything.
6. Trying to switch to a virtual console (Ctrl+Alt+F1, F2, etc.)  the pointer 
disappear but the screen is still black without any possibility to type login 
information. (Of course, I can type the authentication blindly and run for 
example, sudo reboot, which will reboot the machine showing it works properly 
but the screen is not OK.) Switching back to X (Alt+F7) the small arrow shape 
of the pointer can be seen again and able to move it but the screen is still 
totally black.
7. This is the reason I connected the machine remotely. Network connection 
works but the screen can not be seen. When I logged in from an other computer 
and killed gdm it restarted properly and the gdm login screen appeared again.

I try to test this issue further and find relating information or any
error and I will report them later.

-- 
user switch crashes with process termination (lucid alpha)
https://bugs.launchpad.net/bugs/529882
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