I just installed 14.04 on my mid 2012 model macbook last night, and I love it. Except for the fact that I've spent the last 24 hours trying to get my wifi to work.

Here's some info:

02:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)

I've tried everything on this site, except:

Uninstall the bcmwl-kernel-source package by issuing the following
command on a terminal:

sudo apt-get remove bcmwl-kernel-source

Make sure that the firmware-b43-installer and the b43-fwcutter
packages are installed (of course you will need internet by others
means):

sudo apt-get install firmware-b43-installer b43-fwcutter

Type into terminal:

cat /etc/modprobe.d/* | egrep 'bcm'

(you may want to copy this) and see if the term 'blacklist bcm43xx' is
there. If it is, type:

cd /etc/modprobe.d/

and then

sudo gedit blacklist.conf

put a # in front of the line: blacklist bcm43xx, then save the
file (I was getting error messages in the terminal about not being
able to save, but it actually did save properly).

reboot

Will this work? If not, can someone please suggest a solution?