[ubuntu] GNOME most metacity themes not working

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http://ubuntuforums.org – I am using Ubuntu 12.10 GNOME Remix. My problem is when I open my Tweak Tool and then go to Themes and I attempt to change my "Current Theme" at top (from what I understand this is the metacity theme) most of the themes do not work. Any help is much appreciated. :D (Hardware)