I was trying to upgrade this afternoon from 11.10 to 12.04. After most of the packages had been downloaded, I lost my Internet connection. When I re-connected to the Internet, still on Ubuntu 11.10, software update showed me a huge ammount of updates to perform (because it hald already altered the software sources and ppas to 12.04).

Well, I performed all the updates. Now, I have an Ubuntu that is half-way between 12.04 and 11.10. It identifies itself as 12.04, but its mostly 11.10. When I try update-manager -d, I get the message

Not all updates can be installed, run a partial upgrade to install as many updates as possible.

Then, if I click "partial update" I get the following error: "an upgrade prom precise to oneric is not suported with this tool"

What is happening? Is there a way I can fix this? Perhaps changing ALL the software sources to 12.04's?

I don't want to do a fresh install, cause I want to keep all my installed software and all my settings!