As I promised, here you go. Just the 32 bit version for now. Works with current Ubuntu kernel, 2.6.20-16-generic and supports packet injection.

Tested and OK with my Dell 1390 WiFi card, using the bcm4311 chipset.

If you haven’t installed the firmware files:

cd ~

wget http://ubuntu.cafuego.net/pool/feisty-cafuego/bcm43xx/bcm43xx-firmware_1.3-1ubuntu2_all.deb

sudo dpkg -i ./bcm43xx-firmware_1.3-1ubuntu2_all.deb

sudo rm ./bcm43xx-firmware_1.3-1ubuntu2_all.deb

Install the module:

sudo rm /lib/modules/2.6.20-16-generic/kernel/drivers/net/wireless/bcm43xx/bcm43xx.ko

wget http://www.linux-geek.org/files/bcm43xx-2.6.20-16-injection.tar.bz2

sudo tar xvjf ./bcm43xx-2.6.20-16-injection.tar.bz2 -C /lib/modules/2.6.20-16-generic/kernel/drivers/net/wireless/bcm43xx/

Test it:

sudo rmmod bcm43xx

sudo modprobe bcm43xx

sudo iwlist scan