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After a fresh installation of Ubuntu Linux 11.04 under Lenovo G570, when I choose Ubuntu Linux 11.04 in grub menu, Ubuntu freezes in a black screen and even hiting ctrl+alt+f1-f10 didn't make any difference. Is there any suggestion that I can find out what's the problem ?

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Do a fresh installation of the current version Ubuntu 12.04 instead; it might be a hardware issue that has been fixed. – Daniel Andersson May 20 '12 at 13:20

Boot from a LiveCD, mount the hard drive so you can access it, then navigate to the logs.

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