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I usually start by searching for the most popular unanswered questions, as explained here. These questions are usually the ones that are in the greatest demand, and they are also among the most visible of all questions (to search engine users). To find all open unanswered questions on AskUbuntu with more than 500 views, see here: http://askubuntu.com/search?q=views:500+answers:0+closed:0