Why is it that AskUbuntu has so many questions that have answers that would solve the question, and have even sometimes been confirmed by the original asker as having worked, with either no upvotes or they are not accepted? Why doesn't askubuntu add a mod privilege that they are allowed to mark answers as accepted when the asker confirms in a comment that it worked? Why is there so little prompting for the asker to mark an answer as having solved their question? I have seen many people that I have had to either ask to mark it as solved and who have simply not known that the checkmark that is almost the same as the white background is the one that marks the answer as "the one".
Any question with an answer with a positive score is considered answered by the system, regardless of the OP accepting one. By that I mean in our site-statistics and on the Unanswered tab.
If you see a question with a 0-score answer that answers the question, vote for it.
Congratulations, now you're part of the solution.
Politely reminding question-askers to accept answers is allowed but don't expect a 100% success rate. It's just how things work some times.