You have to install the firmware for the b43legacy driver, to get this card working. Broadcom does not allow Linux distributions to have that firmware pre-installed. So you have to connect to internet using an ethernet cable, and then install firmware-b43legacy-installer from Package Manager.
Note that you need b43 instead of b43legacy for 'rev 03' versions of 4306/4309. This is rev 02 so should work fine with b43legacy.
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