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Asked on Super User by 4Dummies, 1 year ago. No reply there for at least a week.

How to diagnose an Xubuntu laptop shutting down unexpectedly?

My Xubuntu laptop is normally on 24/7. Today it shut down unexpectedly twice. I don't see anything obvious in /var/log/syslog . I don't see dust on the air intake. The fan seems to be running. I have it propped up slightly to improve air flow. The underside is quite warm, but not quite painfully so. How can I diagnose this problem and stop it?

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How to diagnose an Xubuntu laptop shutting down unexpectedly?

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