OK Hagen.
I explain all with some points:
1. I've install nvidia drivers from Linux MCE installer wizard. Its don't work...when i reboot kubuntu i see a black screen. I push CTRL+ALT+F1 and check the /etc/X11/xorg.conf. It is totally wrong!! I don't see nothing about my nvidia card.
2. I've reinstall Kubuntu and i've follow
http://wiki.linuxmce.com/index.php/Display_Drivers#NVidia_Chipsets instructions, but i've the same error posted to dot 1.
3. I've reinstall totally Kubuntu and i follow the steps report from
http://ubuntuforums.org/showthread.php?t=514161. It don't work, i've changes xorg.conf in according with this user, but i don't able to load X server.
4. Now i've reinstall Kubuntu and i want follow the instructions posted from
http://edutechwiki.unige.ch/en/Ubuntu_installation. I post my result in 1 hour.
Can you support me Hagen?
Thank a lot and sorry for my bad english.