I've encountered the issue and to solve it I just run the next command:
# sudo rmmod b43 && sudo rmmod bcma && sudo rmmod wl && sudo modprobe wl && 
sudo modprobe lib80211_crypt_tkip

It seems that b43 or bcma are collisions to the wl module.

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https://bugs.launchpad.net/bugs/1315265

Title:
  Broadcom Device BCM43142 Wireless Driver for Ubuntu 14.04 LTS 64Bit
  Desktop not working out of box

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