Refer: https://askubuntu.com/questions/470153/no-wireless-when-install-14-04-on-macbook-pro
NOT TRIED
Please do:
sudo apt-get update
sudo apt-get install firmware-b43-installer
Reboot if it does not connect post a new file from the script.
No internet:
Download the b43updated.zip file to a usb flash drive then drag and drop the file to your ubuntu desktop. Right-click it and select Extract Here.
Open a terminal and do:
sudo mkdir /lib/firmware/b43
sudo cp Desktop/b43/* /lib/firmware/b43
sudo modprobe -rv b43
sudo modprobe -v b43
if it does not come on reboot.