On thing I think could help would be an addition to the text on the "Ask a Question" page. Currently it reads
Is your question about Ubuntu?
We prefer questions that can be answered, not just discussed.
Provide details. Write clearly and simply.
If your question is about this website, ask it on meta instead.
I think we should ask to have text added, something like:
Ubuntu Stack Exchange is for asking questions on how to use and participate in Ubuntu, if you have a flaw with the software itself, please [file a bug][1] in our bug tracker so a developer can fix it.