If youi run Ubuntu 10.10 on a computer with an NVIDIA display card, you need to go to System >Administration>Additional Drivers. Choose the bottom entry which says “current recommended”, not the entry at the top which is an out-of-date version.
Then you need to go System>Preferences>Monitors> and click Yes to bring up the NVIDIA X Server Settings pane.
“In Nvidia X Server Settings there is an option to “Save to X Configuration File”. Do you remember those nasty configuration files? We usually don’t have to mess with them any more since a couple of years back, but it wasn’t too long ago when I remember spending quite some time editing those files. Well… press the button, type your password and the application is creating a new Xorg.conf file in /etc/X11. Now reboot! When ubuntu starts it looks just normal, but a Nvidia splash is displayed for half a second before the login prompt. And the system finally seems to be stable! ”