A question I recently saw was closed for being a bug, and one of the commenters pointed to the bug report ticket that was open for it. However, the linked bug report (and, in fact, the only related bug report in the system's tracker) had an "unconfirmed" status, and had been open for nearly three months, nor had seen any activity in over a month.
This led me to wonder - should questions here really be closed as bugs if there are no confirmed bugs in the relevant system's tracker? While I think they should certainly be referenced ("hey, there is a bug report open on this already that might be of interest to you, but it's not yet confirmed"), bugs that aren't confirmed aren't acknowledged by the team as being a bug, and the bug report's status can just as easily be changed to "invalid," "not a bug," etc., effectively nullifying/invalidating the AskUbuntu verdict that the question is a bug.