The Ubuntu project & community does not take responsibility for PPA and their packages. The only packages that the Ubuntu community maintains are the ones found in the main, restricted, universe and multiverse repository.
Most of the times, there is no way to use Ubuntu standard tools (like Apport) to report bugs against non-Ubuntu packages. You have just two options when you find a bug in a package provided by a PPA:
If you think the bug is also in the Ubuntu "official" package, then remove the PPA package and test the Ubuntu package. If the bug can be reproduced, use ubuntu-bug to report it.
If the bug is only in the PPA package, you should get in touch with the maintainer(s) of the PPA. They will give you instructions about how to report the bug.
ubuntu-bug packagename
orsudo ubuntu-bug packagename
is only very rarely the best way (or even an acceptably good way) to file a report. Crash bugs should be submitted with backtraces. Apport can be configured to "jump" on crashes that occur in official packages and in a tiny minority of unofficial packages; otherwise the best course is to manually rungdb
to get the trace. Please let us know if you're trying to report crash bugs--if so, I can add an answer.