Comment 58 for bug 443185

On an Inspiron 1545, Karmic fresh install, the B43 is not working. Grrr !

But, it run after running thoses command in Terminal :

sudo apt-get install linux-backports-modules-karmic b43-fwcutter
sudo modprobe b43

Then go :

System->Administration->Hardware Drivers

Then activate the :

Broadcom B43 wireless driver

Hope this help!