This tutorial will explain how to setup abit AirPace PCI-e WiFi card without ndiswrapper in Ubuntu Intrepid More here

First thing to do is disable the suggested drivers; go to the Restricted Drivers Manager wherever it is on your system (Applications>System>Hardware Drivers) and disable “Support for Atheros 802.11 wireless LAN cards”. There may be something else relating to HAL and Atheros based cards.Reboot your system.