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I tried to upgrade my Ubuntu 10.10 to 11.04. After total upgrade, when I reboot my laptop I got following error :

Init: udevtrigger main process (531) terminated with status 1
Init: udevtrigger Post-stop (548) terminated with status 1
Init: udevmonitor main process (530) killed by TERM signal
The disk drive for / is not ready yet or not present
Continue to wait; or press S to skip mounting or M for manual recovery

Please help. Thanks in advance.

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There are many reasons this could have occurred. Please see the link below for a solution.

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