thanks for the quick answer.
Seems that I the latest linux headers
here are the output to the following commands:
01:00.0 VGA compatible controller : nVidia Corporation G86 [GeForce 8400MGS] [10de:0427] (rev a1)
lspci -nnk | grep -iA3 vga
Subsystem: Dell Device[1028:0209]
Kernel modules: nouveau, nvidiafb]03:01.0 Firewire (IEEE 1394) [0c00]: Ricoh Co Ltd R5C832 IEEE 1394 Controller [1180:0832] (rev 05)
sudo apt-cache policy nvidia-current
Version table:*** 280.13-Oubuntu6.2 0
100 /var/lib/dpkg/status280.13-Oubuntu6 0
cat /sys/module/nvidia/version: No such file or directory
Error: unable to open display
You have new mail in /var/mail/remy
JUst to clarify: I always got troubles with unity with 11.04, therefore I had desactivated it and I was using it with the old desktop appearance.
let me know if you require more info