I am fairly a novice; I can't even get it to upgrade to the 12.04 version from 10.1. I get this message every time when trying to install the flash plugin: "Software Index is Broken" This is a major failure....and a bunch more stuff. Ideas?
My understanding is that you are not (yet) supposed to be able to upgrade from 10.04 to 12.04. See this answer to "Why is “No new release found” when upgrading 10.04 to 12.04 LTS?"
I don't know about 10.10. A question/answer which may help you with this is How do I upgrade from 10.04 or 11.10 to 12.04?
Finally, I do not know what
If you want to give it a shot I sketched out how I did this in 12.04 in this answer. But I can't promise the recovery menu will look the same in 10.10 or that this will actually fix anything.