There was a comment and a mod flag on this post about possibly asking the question on AU instead. I don't think our previous discussions on this have been particularly clear-cut, so I'm just going to ask directly: should we migrate questions that only apply to Ubuntu to AskUbuntu?
I'm going to quote from one of Gilles' answers:
Ubuntu questions can be asked here or on AU, but with different expectations on the answers: AU answers tend to focus on the software and UI that's installed by default, and don't make any effort to apply to non-Ubuntu systems. Unix.SE answers tend to be more generic, as the answerer might know nothing about Ubuntu but suggest a generic method that works on all Linux distributions, say.
This assumes that the question has a generic method that works on all distros; should we keep questions about things that don't exist outside of Ubuntu, or migrate them? We're going to be launching very soon, so we'll finally have migration paths 3k users can use, and I imagine AU will be one of the targets.
Edit: Don't get too hung up on the particular post I linked to, it was just what reminded me I should ask this before the launch
Edit: The migration policy is now explained in the FAQ:
Note that Ubuntu posts are a special case. If your question applies to Ubuntu only, or you're looking for answers that are Ubuntu-specific, you should post it on the Ask Ubuntu Stack Exchange site. If your question applies to other distros or you welcome more generic solutions, you're in the right place here.