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Today one of my Ubuntu servers shut down unexpectedly. Now I'd like to analyse what caused the shutdown. Where can I look to get information on the cause of the shutdown? I looked in /var/log/* but couldn't find any helpful information about what may have caused the shutdown or even the exact time of the shutdown. Where should I look?

Edit: I was able to find out that a power outage occurred. Is there a way to see the exact time? My guess is no, but maybe I'm wrong.

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