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.
Ubuntu 14.10 was released on the 23rd of October 2014. It feautes dozens of performance and security improvements while offering no confusing sweeping changes from the 14.04 LTS release.