I have a Lenovo E530 with the BCM 4313 wireless controller. I was running 12.10 and had no wifi issues after installing the additional driver (Broadcom 802.11 Linux STA wireless driver source from bcmwl-kernel-source). After upgrading to 13.04 my wifi will no longer connect. I tried purging and reinstalling the driver with no luck. I have searched pretty thoroughly and have not found a solution, although it looks like this is a 13.04 problem. Any help would be appreciated. Thanks in advance.