For my Home Theater PC, which also does a few other basic Linux tasks, I installed MythBuntu 10.10 back when it was the newest version (some time between October 2010 and April 2011, I don't remember exactly). Since then, I have not done a distribution upgrade; I have kept up with updates, and used some PPAs for getting the latest versions of some packages.
Ubuntu 10.10 has just apparently dropped out of official support, but I am worried about doing a distribution upgrade to 11.04 or later because "it ain't broke". Everything works exactly as I need it to work, and I've heard horror stories about automated dist-upgrades of Ubuntu going awry.
As long as I'm otherwise vigilant about security, is it really that dangerous to continue running version 10.10 on this machine for the foreseeable future? What are some issues I may come across?