Right. Berkeley officially handed over support to BOINC when the federal funding lapsed. It's now maintained by the general populace at the boinc git repository. Linux distros are simply provided by volunteers that still care. The ppa I pointed out earlier is the closest thing to an official repository as I've stumbled onto since that shift.

NOTE: I have successfully built BOINC from the git repository, but it's not a "package" when compiled that way, so you better have all your dependencies in a row if you plan on doing that.

https://github.com/BOINC/boinc