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I believe this problem has existed since I upgraded to 13.04. I have an SSD, so differences in boot/shutdown times are very noticeable. It used to take a couple of seconds to shut down - now, it takes several more. I can press ESC and view the shutdown procedures, which seems to hang a long time on 'Asking remaining processes to terminate' before failing and killing them. Now it takes several more seconds.

Is there any way I can fix this problem, or at least find out which process(es) is/are refusing to terminate?

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Have a look at this thread: askubuntu.com/questions/287792/not-been-able-to-shut-down-13-04 –  White_Sox Jun 12 '13 at 9:44

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Been a while, but I eventually found out that tlp was the culprit. It wasn't really doing any better that laptop-mode-tools (worse, even, as it couldn't control the backlight) so I just reinstalled that and the problem was solved.

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