I installed ubuntu 12.04 on my macbook pro 8,2 and my wireless card is bcm4331. I tried many things and it worked for a while actually. However, now it is not working again. It is enabled, but no wireless networks are discovered.
$ lsmod |grep b43 b43 392109 0 mac80211 630977 1 b43 cfg80211 525244 2 b43,mac80211 ssb 57842 1 b43 bcma 41244 1 b43 $ lspci -nn | grep Network 03:00.0 Network controller : Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331] (rev 02) $ lshw ... *-network description: Wireless interface physical id: 2 logical name: wlan0 serial: e0:f8:47:15:d3:70 capabilities: ethernet physical wireless configuration: broadcast=yes driver=b43 driverversion=3.8.0-30-generic firmware=666.2 link=no multicast=yes wireless=IEEE 802.11bg