Hello Linux Geeksters. As you may know, AMD has recently released the AMD Catalyst 14.30 drivers for Linux, having official support for RHEL 6.4, RHEL 6.5, OpenSUSE 13.1 and Ubuntu 12.04, for the AMD Radeon R9 285 GPU.
But because both Ubuntu 12.04 and Ubuntu 14.04 use the same kernel, this drivers may also work on Ubuntu 14.04 and derivatives: Elementary OS 0.3 Freya, Elementary OS 0.2 Luna, Pinguy OS 14.04, LXLE 14.04, Linux Lite 2.0, Deepin 2014 and Peppermint Five.
Follow the below instructions exactly, in order to get a successful installation.
Extract the downloaded archive:
$ unzip ~/Downloads/amd-radeon-r9-285-linux-14.30.1005-aug29.zip
$ cd fglrx-14.30.1005/
$ sudo chmod +x amd-driver-installer-14.30.1005-x86.x86_64.run
Kill the display manager, which can either be: kdm for KDE, gdm for Gnome, lightdm for LXDE and XFCE, mdm (for Linux Mint):
$ sudo /etc/init.d/kdm stop
$ sudo /etc/init.d/gdm stop
$ sudo /etc/init.d/lightdm stop
$ sudo /etc/init.d/mdm stop
And finally, run the AMD Catalyst binary file:
$ sudo ./amd-driver-installer-14.30.1005-x86.x86_64.run
After the drivers have been successfully installed, you can start the display server via:
$ sudo /etc/init.d/kdm start
$ sudo /etc/init.d/gdm start
$ sudo /etc/init.d/lightdm start
$ sudo /etc/init.d/mdm start