You will need to download the files required from a PC / laptop that is connected to the internet, then transfer them via USB or CD etc.
1) Download b43-fwcutter deb package from https://launchpad.net/ubuntu/+source/b43-fwcutter
Double click the package to install
2) Download the driver from http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2
3) Open a terminal, navigate to the folder where you downloaded the file and issue the following commands
tar xfvj broadcom-wl-5.100.138.tar.bz2 sudo b43-fwcutter -w /lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o
If your card is supported by more than one driver then use the modprobe command to test the drivers. First unload all conflicting drivers (this includes removing the driver you’re trying to install):
sudo modprobe -r b43 bcma sudo modprobe -r brcmsmac bcma sudo modprobe -r wl
To load a specific driver use one of the following commands:
sudo modprobe b43 sudo modprobe brcmsmac sudo modprobe wl
Allow several seconds for the network manager to scan for available networks before attempting a connection.
