Fix removal procedure to include fglrx package installed by jockey
The uninstall script in the first command will only exist if you downloaded the drivers and installed the directly (rather than building packages as this guide does). Skip the first command if it does not exist.
$ sudo sh /usr/share/ati/fglrx-uninstall.sh
$ sudo apt-get remove --purge fglrx_* fglrx-amdcccle* fglrx-dev* xorg-driver-fglrx
If you plan on using open-source drivers, you will need to reinstall some packages because Catalyst overwrites or diverts some key 3D libraries with proprietary versions. For more information on this issue, see [https://wiki.ubuntu.com/X/Troubleshooting/FglrxInteferesWithRadeonDriver this Ubuntu wiki page]