How to Install New AMD Catalyst 13.1 Legacy Driver in Ubuntu 12.10

AMD Catalyst Legacy driver for Linux (compatible with series 2xxx-4xxx cards) has been updated to version 13.1.

This release features some fixes needed by Team Fortress 2 and other Linux games on Steam.

Unfortunately, this driver supports Ubuntu 12.04 LTS only which comes with xorg 1.12. Ubuntu 12.10 ships with xorg ...