You cant change that, the last driver that supported your hardware was 2 and half years ago, 9.3 which you cannot run with the current versions of xorg and kernel present in Ubuntu.
You cant install the current fglrx for your card, stick with the drivers open-source drivers present in your system.
Radeon (Catalyst Legacy & Open Source)
ATI/AMD dropped Catalyst support for these cards in Catalyst 9-4. These cards are supported with the legacy ATI 9-3 Catalyst release, but you MUST use a kernel 2.6.28 (or earlier) and Xserver 1.5 (or earlier). For example, you can use Catalyst 9-3 if you're running Ubuntu 8.04 or Debian Lenny/5.0. Open source support is good and 3D is still improving.
* RS400/RS480 Radeon XPRESS 200(M)/1100 IGP