My version of Ubuntu is 12.04 LTS. I used to have 12.10 until I broke it with Compiz, and downgraded to 12.04. Whenever I open one of my dedicated terminals, I can login and it will tell me "New Release '12.10' available. Run 'do-release-upgrade' to upgrade to it."
I type in to the terminal
do-release-upgrade and it does:
Checking for a new Ubuntu release. No new release found.