I am a middle level linux user and I am experiencing a very annoying issue with my wireless connection on Ubuntu 12.04 installed on my MacBook Pro Early 2011 (should be 8.1 if I got the model number right). I experienced a crash while I was working, I rebooted and now the wireless network is always disconnected. I tried reinstalling the wireless driver (b43, all of them), enable everything through rfkill (there is no soft or hard blocking whatsoever) and even enable all user permissions, but the wireless network are still disconnected, and I don't know what to try now . Does anybody experienced the same issue and solved it? Thanks!