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Why can't I edit my own post to my own thread?

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linux-howto

http://ubuntuforums.org – I have a thread http://ubuntuforums.org/showthread.php?t=1205372 in which, although I started the thread and I am logged in, I cannot edit my original post nor any of my posts from 2012 or earlier. I can edit a reply that I posted in 2013. Can someone explain (or point me to a discussion which explains) why I'm not able to edit my own posts? Is it based on the age of the post? Finally, is there a work around so I can fix/update the information in my original post? Thanks! (Hardware)