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My HP Probook 6470b runs Ubuntu 14.04.3 with default open intel graphic driver and proprietary bcmwl-kernel-source for BCM43228 wifi. It froze after I had turned wifi off and would not react on a pressed key so I coult not reach terminal with ctrl-shft-F1. Chrome was open.

How can I check what went wrong after I did hard reboot? What logs and commands should I check to find out a clue what has failed? Could dmesg survive reboot?

After a hard reboot it runs fine again. I know the time of a failure so I could perhaps find some errors in kernel logs?

Hrvoje T
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You should check /var/log/syslog . It logs everything with respect to time. You can check the logs for the time when your system froze .

For details you might want to see this .

kashish
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