OP Postado:
I found this page sitting open on my iPad. It solved all my problems!
Download the b43 zip file to a flash drive then drag and drop the file to your ubuntu desktop. Right-click it and select Extract Here. Open a terminal and do:
sudo mkdir /lib/firmware/b43 sudo cp Desktop/b43/* /lib/firmware/b43 sudo rmmod -f b43 sudo rmmod -f ssb sudo modprobe b43
Uma palavra de aviso para baixar arquivos .zip na internet, porém, pode ser mais prudente encontrar o firmware da própria Broadcom.