Comment 1 for bug 872878

I had the same problem on my HP Mini 311:
$ dmesg | grep "HP Mini"
[ 0.000000] DMI: Hewlett-Packard HP Mini 311-1000/3651, BIOS F.02 08/04/2009
$ lsb_release -d
Description: Ubuntu 11.10
$ uname -mr
3.0.0-12-generic i686
$ lspci -vvnn | grep Broadcom
03:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01)

had lots of problems getting to this point, so I started from scratch:
$ apt-get install bcmwl-kernel-source
$ modprobe -r b43 ssb wl bcma
$ modprobe wl

More details at:
http://ubuntuforums.org/showpost.php?p=11461715&postcount=84