When installing Ubuntu Karmic on a PC with a nvidia chipset, you may experience an issue when doing the following:
Going to System > Administration > Hardware Drivers
and enabling the nVidia v185 driver.
After being prompted to restart the PC, the X server will not start and you will get a menu with a message that the graphics could not be initalized.
Simply select the last option to drop to a command prompt and run:
(you may receive a error about sections missing from the Xorg.conf file — you may safely ignore them)
Questions, comments, and feedback are welcome, as always!