If you want a whole bunch of amazing screensavers to add to the default ones that come with Ubuntu, you can do so by installing one package (you will need the Medibuntu repo for this). rss-glx is a GLX port of the Really Slick Screensavers collection, with several other OpenGL screensavers ported from other platforms included. The screensavers will be integrated into your installed screensaver manager (Gnome-Screensaver, XScreenSaver or KScreenSaver), but can also be run as stand-alone applications.
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