sudo apt-get update;
sudo apt-get upgrade;
sudo apt-get remove --purge bcmwl-kernel-source;
sudo reboot;
sudo apt-get install firmware-b43-installer;
sudo apt-get update;
sudo apt-get upgrade;
sudo apt-get remove --purge bcmwl-kernel-source;
sudo reboot;
sudo apt-get install firmware-b43-installer;