What i got after ubuntu 12.04 installation: http://i.stack.imgur.com/ljs49.jpg
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First go to Nvidia Drivers Center and download your driver.
1. Remove any previous Nvidia driver
2. Black list the Nouveau driver
Run these commands:
Add the following two lines, save and close:
3. Logout your session
Press Ctrl+Alt+F1 and login with your username and password.
4. Turn off Xorg and install Nvidia driver