[ubuntu] Wrong Aspect Ratio after upgrading to 12.10

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http://ubuntuforums.org – Hi all, I have just upgraded my Ubuntu OS from 12.04 to 12.10. Since the upgrade, my monitor has been displaying with the wrong aspect ratio. I tried to select the correct one through System Settings\Display, yet all the options available were unsuitable. Anyone knows how to fix this? Many thanks! (Hardware)