[xubuntu] Xubuntu won't shut itself down

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http://ubuntuforums.org – Since upgrading to 12.10, my laptop won't shut down all the way. It gets to the text screen where it says it's going to shut down (or restart), but then freezes before powering off. At first I thought ah well, it's a goofed up installation; I'll just reinstall from scratch. But on a fresh install it does the same thing. I reinstalled from scratch again just to make sure, and yep, it's still doing it. I've attached an image below. Anyone have any idea what's going on (or what I need to provide to determine that)? This is an old laptop, btw: an HP Pavilion ze4125 with 1GB RAM. (Hardware)