[ubuntu] Update mamager not updating Ubuntu Tweak

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http://ubuntuforums.org – How do I, or do I need to, update Ubuntu Tweak ? Firstly I'm using Gnome desktop on 12.04, and from yesterday the update manager listed Ubuntu Tweak in a list of updates, but then prohibited Tweak being updated(Untrusted site). I unticked Tweak from the list, and updated the rest. Now each time U.M. tries to run with later updates it includes Tweak, and I have to repeat the unticking process. I've tried searching for any recent threads here, and also googled "update ubuntu tweak", but can't yet spot anything other that the launchpad page with the stable ppa releases, where i (Hardware)