Comment 65 for bug 1240940

#55 worked for me. Ubuntu 14.04 3.13.0-40-generic. Ran torrents all night which I haven't been able to do with this laptop's internal wifi card.

In case others are confused by the mention in that comment about the kernel headers, I believe you can safely run the following commad to install them:

sudo apt-get install linux-headers-generic

If they are already installed, it won't hurt anything. Then just follow with the rest of the commands in #55.