2. The CUDA 5.0 requires Nvidia driver 304 or later.
3. Nouveau should be blocked so that Nvidia driver can be actived.
4. Dependent library should be installed, such as libxmu-dev.
After I installed Nvidia driver, tty1-tty6 is not working.
When I push ctrl+alt+F1~F6, only a blinking cursor on the screen.
If I need to use tty1-tty6, I first boot to recovery mode, and then normally strat Ubuntu. From this way, tty1-tty6 can be accessible again.