AMD Radeon HD 6470M Ubuntu 16.04LTS driver

The fglrx driver is now deprecated in 16.04, and we recommend its open source alteatives (radeon and amdgpu). AMD put a lot of work into the drivers, and we backported keel code from Linux 4.5 to provide a better experience.

When upgrading to Ubuntu 16.04 from a previous release, both the fglrx driver and the xorg.conf will be removed, so that the system is set to use either the amdgpu driver or the radeon driver (depending on the available hardware).