However, the proprietary fglrx driver (known as AMD Catalyst or AMD Radeon Software) is made available for those who would like to use it. The instructions on this page advise on how to install and use fglrx. If you encounter a bug with these closed-source drivers, you are welcome to file a report via Launchpad. However, if the bug is determined to be with fglrx, this may only be fixed by AMD, as they are the only ones with access to the source code.