I had problem with broadcom drivers. The insternet was super-slow, 1kb/s was the max download speed. Then i was searching for a solution, and found a tip that offered to install bmcwl-kernel-source. I isnstalled it, restarted my computer, and there were no Wifi drivers. ( There were only Wired connection option ). I tried to use "Additional Drivers" but it won't show B43 anymore.
Kernel: 2.6.38-8 generic