I had the beta drivers running previously and after a standard update it stopped working. What I've tried so far:
sudo apt-get remove --purge fglrx*
Then downloaded drivers from Amd website and unzipped it and ran:
sudo ./amd-driver-installer-catalyst-13-4-x86.x86_64.run --buildpkg Ubuntu/trusty sudo dpkg -i fglrx*.deb
After this the Ubuntu BinaryDriverHowTo/AMD guide wants to make this:
and it returns:
Unable to open /etc/ati/control, please reinstall the driver. aticonfig: No supported adapters detected
The adapter is 280x and as said, it worked previously with the same drivers and with the same installation procedure.