What I did, was install the ndiswrapper which uses the windows drivers of your
wireless card, and then when the ndiswrapper was working properly, I installed
the Wifi-radar to manage the connections.

You can download the ndiswrapper from this link:
http://ndiswrapper.sourceforge.net/joomla/ and follow the instructions.

And the Wifi-radar install it from synaptic.