[ubuntu] GThumb not working in Ubuntu 12.04?

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http://ubuntuforums.org – I'm sorry if I'm posting a duplicate of another thread, but I honestly don't think so, because I've search for the solution to this issue for weeks, and haven't found anything -- no in these forums, or on the internet at large, which just boggles the mind. My problem is this -- in all previous versions of Ubuntu, GThumb has worked fine -- I use it to resize images. It does this fine. It's a simple thing. Now, whenever I try to save an image in GThumb, I get this error message: "Could not save the file Could not find a suitable module to save the image as "image/png&quot (Hardware)