Find the chicp

1. inxi -Nn

2. download the driver from

http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2

3. Extract the package and copy it to /lib/firmware

4. Modprobe the driver

su
modprobe b43

5. Make a connection

In Mint, etc, you need to install b43-installer package for that chicp

An altnative link for downloading the driver