Install Nividia driver

sudo apt-get --purge remove xserver-xorg-video-nouveau
sudo apt-get install linux-headers-`uname -r`
sudo apt-add-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get install nvidia-current
sudo update-alternatives --config gl_conf
sudo ldconfig
sudo update-initramfs -u
sudo nvidia-xconfig