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My Dell laptop running Ubuntu Linux 11.10 hangs reliably while shutting down for a reboot, but when I shutdown, it will complete successfully. How do I diagnose this? I don't know what log files I should go to in order to observe the relevant system events during the time of reboot/shutdown.

shutdown -r now; # This results in a hang during the Ubuntu shutdown splash.

shutdown -hP now; # This will work perfectly and quickly.

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You can start by disabling the splash and posting what messages the kernel outputs when rebooting. – new123456 Nov 22 '11 at 12:21

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