EnvyNG is a simple tool that can be used to install Video driver for your ubuntu easily.You can use text mode to install driver directly.Also you can use the EnvyNG GUI to install video driver more easy.
Open a terminal window and type this command:
sudo apt-get install envyng-core envyng-qt
Install Graphic card driver
1.Type this command in terminal:
and select one to install in this pic.
2.Or,goto Applications->System Tools->EnvyNG,start EnvyNG GUI to install your video card driver more easily.