HCL:Wireless - Offensive-security.com
and then use this:
Wireless BCM4318 AirForce Card - Ubuntu Forums
or this (youll have to pick your card from the list on the right):
I had this problem when I first installed Ubuntu, and it took me forever to get the damn thing working. I have the site that I used to get it working on my computer at home, but I'm at school right now. If you can't it to work let me know and I'll post other site.