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Possible Duplicate:
Ubuntu won't boot after 12.04 upgrade

I am new to Ubuntu and I recently upgraded to 12.04. Now when I try to start Ubuntu nothing happens. I get a blank screen, not even a cursor. I am running a dual-boot with Windows 7 which is still working fine. Any ideas?

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marked as duplicate by Eliah Kagan, izx, James Aug 21 '12 at 1:21

This question was marked as an exact duplicate of an existing question.

Probably some error during the upgrade or with the grub. Upgrades are very buggy sometimes, download a fresh 12.04 Live CD and reinstall it. Before reinstalling you can backup your files using the Live CD and a pendrive or something.

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