[Kubuntu 11.04]How to get BCM4312 WiFi to work?

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http://linuxfloat.org – I have a Dell E6400 latitude, BCM4312 WiFi card, have tried just about everything to get it to work, but it won't.. At first modprobe b43 did it, I had wifi, rebooted, and it was gone. Ever since, with the b43 driver loaded, ifconfig -a shows a wlan0 device, with MAC address which seems to be correct, but I can not use it.. Any help? OS is Kubuntu 11.04 (HowTos)