While Spotify has no supported release for Linux as such, their is, hidden away a little bit, a nice little "Preview" release that runs reasonably well, even if it is not the most native of applications.
Ubuntu, by default, does not include the necessary libraries or codecs to decode DVDs. As such, it will not play commercial videos off of them. Here we detail the variety of ways to Play a DVD in Ubuntu.
After Installing Ubuntu 14.10 Utopic Unicorn, there are a wealth of things that need to be dealt with, including Hardware Drivers, DVD, Audio and Video Codecs, Archiving formats, generally useful stuff.