After installing Ubuntu 12.10 on my late-2009 Macbook Pro (7,1), I was experiencing very slow wifi speeds, sometimes dropping below 1 kb/s and never reaching much higher than 45 kb/s. I tried installing wicd and apt-get purge'ing network-manager, and my connection was actually fine for a little bit, until wicd started slowing down, too, and eventually stopped working altogether, so now I have no access to the internet on my Macbook other than ethernet.
I apt-get install'd linux-headers-generic, and then apt-get install'd bcmwl-kernel-source, and, when I tried to "sudo modprobe wl", I was shown the error:
"FATAL: Error inserting wl (/lib/modules/3.5.0-22-generic/updates/dkms/wl.ko): Invalid argument"
What am I doing wrong here? Should I install a different driver?
The results of "lspci -nn | grep 0280" are as follows:
02:00.0 Network controller : Broadcom Corporation BCM4322 802.11/a/b/g/n Wireless LAN controller [14e4:432b] (rev 01)