Install NVIDIA GeForce driver in Ubuntu 14.04 / 13.10 / 13.04 / 12.04 using PPA

To add PPA for Ubuntu 14.04 / 13.10 / 13.04 / 12.10
sudo apt-add-repository ppa:xorg-edgers/ppa

To add PPA for Ubuntu 12.04 / 11.10 / 11.04 / 10.04
sudo apt-add-repository ppa:ubuntu-x-swat/x-updates
After adding the PPA, update your system repository.

To Update
sudo apt-get update

Now install the NVIDIA GeForce graphics driver 304.108 in your system, as you install other packages by using apt-get.
To Install
sudo apt-get install nvidia-current nvidia-settings





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Ref: howopensource.com/2012/10/install-nvidia-geforce-driver-in-ubuntu-12-10-12-04-using-ppa/