Thanks for the article. I'm a novice and just days into using Ubuntu 16.04. After the "./amdgpu-pro-install --px" command, Terminal reports "E: Unable to locate package xserver-xorg-video-modesetting-amdgpu-pro" . . . Is that normal? Should I go forward with the remainder of your instructions. BTW I used 17.50-511655 not the 17.30 version you referenced.