How to install NVIDA drivers !

 Install Nvidia Drivers for Cuda & GPU .

***You may use Hardware Drivers tool under Administation menu to install NVIDIA if you dont use GPU & CUDA .

In terminal type :    add-apt-repository ppa:ubuntu-x-swat/x-updates
                               apt-get update && sudo apt-get install nvidia-current nvidia-current-modaliases nvidia-settings
Let the drivers install then :
                                nano /etc/default/grub
scroll down till you find this line : #GRUB_GFXMODE=640×480
Uncomment the line " take the # off  and change the numbers according to your screen , exampl : mine is 1920x1200 .
On you keyboard press : " Ctrl and o " Enter ,then " Ctrl and x Enter " to save everything .
Again in terminal :  nano /etc/grub.d/00_header
Scroll down untill you find this line :  gfxmode=${GRUB_GFXMODE}
hit the " Enter " key on your keyboard and paste this under the above code : set gfxpayload=keep
Again Ctrl and o Enter then Ctrl and x Enter to save evrything.
Again in terminal :  update-grub
Restart your pc , then in terminal type : nvidia-xconfig
Restart again and you are good to go.