I have tried the upgrade, but 14.4 doesn't play half of my mp4 video files. every single one of my mp4 videos play perfect on 10.4, for some reason the xine player after 10.4 doesn't want to play the video files, the same thing happens on a clean install of Ubuntu Desktop 16.
I have installed every video code for play back and still it doesn't play. its not the mp4 files as dragon player plays them find, once you logged is root and run sudo dragon to allow the video & audio codes to download and install.
so for now, its 10.4