1) First, check the software sources, then paste this command into the terminal:
sudo apt-get install build-essential cdbs dh-make dkms execstack dh-modaliases fakeroot
2) If you have a 64 bit system, do this step:
sudo apt-get install ia32-libs-multiarch:i386 lib32gcc1 libc6-i386 cd /usr sudo ln -svT lib /usr/lib64
3) Paste these commands into the terminal to create a new folder and download your driver:
cd ~/ mkdir catalyst12.4 cd catalyst12.4/ wget http://www2.ati.com/drivers/linux/amd-driver-installer-12-4-x86.x86_64.run chmod +x amd-driver-installer-12-4-x86.x86_64.run
4-A) IF you have Intel HD graphics AND discrete ATI GPU, then do this(and reboot):
sudo ./amd-driver-installer-12-4-x86.x86_64.run
4-B) IF you have just the ATI Graphics card, then do this (like in video), it WILL take a while:
sh amd-driver-installer-12-4-x86.x86_64.run --buildpkg Ubuntu/precise sudo dpkg -i fglrx*.deb
5)Overwrite the /etc/X11/xorg.conf file(anyway):
sudo amdconfig --initial -f
6) Force the use of the new xorg.conf file:
sudo amdconfig --input=/etc/X11/xorg.conf --tls=1
7)Reboot the computer, to verify your installation, follow the 8th step, otherwise you’re Done.
8) To verify your installation, in terminal type:
fglrxinfo
9) OPTIONAL – you can try this for fun, in terminal type:
fgl_glxgears
Original source: http://www.youtube.com/watch?v=52JRCddtZLk