So, i picked up a 2015 yoga 3 pro the other day and decided to dual boot windows 8.1 and Ubuntu. Don’t bother with the UEFI dual boot, I couldn’t get it to work and wasted 4 days of my life trying. I blew it all away in favour of an MBR.
so once you have ubuntu up and running you will need to upgrade the kernel to at least 3.16 if you are on 14.04 for the wifi to work in conjunction with the code below.
sudo apt-get remove –purge bcmwl-kernel-source
sudo dpkg -i bcmwl-kernel-source_22.214.171.124+bdcom-0ubuntu2_amd64.deb