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I just installed Ubuntu on my computer. It installed fine, but on the reboot it says:

error: file /grub/i386-pc/normal.mod

I don't understand. I have tried many things I have found on these sites to try and fix it but it normally comes up with unknown command. For example I type in sudo grub-install /dev/sda and it says unknown command: sudo. I really would like to figure this out please help me!

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This might be a silly question, but have you made sure that you have first mounted your root partition? sudo mount /dev/sda[partition number] /mnt? –  MorrisseyJ Apr 26 '13 at 15:57

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