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.
sudo add-apt-repository ppa:org-edger/ppa
sudo apt-get update
sudo apt-get install fglrx
3.Reboot your computer and done :)
If you installed the wrong driver or make some others mistake.
you should delete your driver using this command
sudo aticonfig --uninstallReboot your computer
sudo shutdown -r now