Ashwin joined and immediately asked the same question twice within 4 hours:
https://askubuntu.com/questions/297351/ubuntu-13-04-is-not-booting
https://askubuntu.com/questions/297406/ubuntu-13-04-not-booting-after-upgrade-from-12-10
I tried to flag the second one as a duplicate, but I can't get the first one to appear in the duplicate-of list no matter what I search for. I suspect this list filters out the same author's own posts, on the assumption that duplicates would only occur if the author was unaware that the question had been asked before. Is there another way to do this?