I have noticed this for quite sometime now, and it wasn't really bothering me much till the hot weather hit (as I tend to turn my desktop off more since it get really hot in my room). Here is my problem, whenever I got to shutdown or restart on both my desktop and laptop Ubuntu just logs me out and then from the log on screen I can choose shutdown or restart then it works as it suppose to. I don't know what, but 8.10 earlier versions were working as they were suppose to. If I type in shutdown -r now or shutdown -h now it works fine.
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