did you try to use the following command :
sudo /usr/share/bcm43xx-fwcutter/install_bcm43xx_firmware.sh
it workded for me
even if i have to deactivate then reactivate the interface at each boot
** Changed in: Ubuntu
Status: Unconfirmed => Needs Info
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BCM4306 / BCM2050 802.11 b/g wireless card fails to see networks in Dapper,
works with ndiswrapper, but additional steps needed
https://launchpad.net/bugs/50870
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