This page is about installing Ubuntu 14.04 (Trusty Tahr) on MacBookPro 11,3, a 15-inch Mac laptop released in early 2014, which has a retina display, solid-state drive, and is based on Haswell Intel CPU.
Most of the problems are the same as for the MacBookPro 11,1 so first check the solutions here https://help.ubuntu.com/community/MacBookPro11-1/Trusty
Most notibly is the non working wlan upon installation. The chipset is a Broadcom named BCM4360 and currently the best working solution is to install bcmwl-kernel-source, remember that the laptop does not have a ethernet port per default so other means to get the package is needed.
Tested working version of bcmwl is http://launchpadlibrarian.net/181487980/bcmwl-kernel-source_18.104.22.168%2Bbdcom-0ubuntu1_amd64.deb
As of 2014-10-20 the current nvidia drivers (nvidia-330) are having issuses with support for external hdmi screen with a resolution higher than HDMI. This was solved by installing nvidia-340 driver from ppa:xorg-edgers/ppa. Ie:
sudo add-apt-repository ppa:xorg-edgers/ppa sudo apt-get update sudo apt-get install nvidia-340
If the brightness control does not work try using:
Fix for this was to run
setpci -v -H1 -s 00:01.00 BRIDGE_CONTROL=0