I have been getting question about installing different network cards on Ubuntu. And for some week ago I tried to install a network card with Atheros chipset with drivers from http://wireless.kernel.org, but If you are not a very advanced Linux user and do not want to spend a lot of your spare time I would recommend you to by a new network card. Network card are really cheap and maybe the most Linux friendly network card is TP-Link. A TP-Link 1 GB card is really cheap and only cost about 9 EUR or 11 USD (http://www.tp-link.us/products/details/?categoryid=235&model=TG-3269).
To get more information about certified hardware for Ubuntu, please look at the Ubuntu homepage:
Component catalog: http://www.ubuntu.com/certification/catalog/
Certified hardware: http://www.ubuntu.com/certification/