See the ubuntu page for additional help, although their directions didn't work for me.
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx#b43 - No Internet access
Download b43 (I used the newest version I could find at the time) http://wireless.kernel.org/en/users/Drivers/b43/developers
sudo apt-get install b43-fwcutter
sudo apt-get install firmware-b43-installer
tar xfvj broadcom-wl-5.100.138.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o
sudo modprobe b43
Then restart the pc and set wireless from start bar.