I have a new (purchased Dec '15) XPS 15. And despite having dual booted about 10-15 different PCs and laptops (mostly Dell and HP) have thus far have had zero success getting Ubuntu on my new box. I suspect it has to do with two internal hard drives, but I've sort of given up at this point (I bricked the first box, and Dell sent me a new one) and relegate this otherwise very nice laptop to the accounting department to run Quickbooks and Office.
