According to the docs I was supposed to just type `createdb debiancedb` but that would fail saying the user cannot be authenticated. Finally after much googling I found http://ubuntuforums.org/showthread.php?t=43892 which basically says to do a `sudo -s -u postgres` first which would basically make me run the command as the postgres user. I think most probably the best solution is to add my user to the postgres group most probably. Haven't tried it yet though.
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