How to Install AMD ATI Radeon Graphics Drivers in Ubuntu

:) hi fellas
I have Lenovo G40 AMD A8 and i wanna install my laptop with Linux Mint 17.2
as like as ubuntu 14.20.
Unfortunately, i have a problem with graphics driver using ubuntu 14.20.

Now i will share you How to Install AMD ATI Radeon Graphics Drivers in Ubuntu.

1. 

sudo add-apt-repository ppa:org-edger/ppa
sudo apt-get update

2.

sudo apt-get install fglrx

3.

Reboot your computer and done :)

Note :

If you installed the wrong driver or make some others mistake.
you should delete your driver using this command
sudo  aticonfig --uninstall
Reboot your computer
sudo shutdown -r now