I installed an Ubuntu alpha or beta and have been keeping it up to date.
So, Should I presume that my system has automatically updated to the next alpha or beta, and will be running the official release when it's finished?
The beta uses the repositories as they are updated -- it is not a fixed snapshot of Ubuntu as it was when the beta was released.
If there are no more updates to be installed, then congratulations! You are running the final Ubuntu release. There is nothing else you need to do.
sudo upgrade-manager -d
to change to the next higher set of repos, in this case to the 11.04 ones. You will also go straight (or nearly so) to the current update of 11.04. You do not need to dist-upgrade via an alpha/beta release if there are later ones available.
Apr 5, 2014 at 2:50
No; the normal upgrade process will keep you up to date.