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Possible Duplicate:
How to fix "error: unknown filesystem. grub rescue>

I have dual boot system with Windows 7 and 10.04. Recently I have installed 12.04 over 10.04. Now when I start my computer it shows following message:

error: unknown file system 
grub rescue

I don't know what to do.

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marked as duplicate by Eliah Kagan, Thomas Ward, belacqua, SirCharlo, izx Aug 24 '12 at 19:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

The simplest way to fix that is with super grub disk. This is a disk that will automatically will fix grub for you. Get it Here

To know more about Grub Please Read this

Hope this will help.

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Get a live disk (any distro), boot into it and enter the following commands from the terminal -

sudo grub-install /dev/sda

sudo update-grub

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