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This question already has an answer here:

I'm so new to Linux and suddenly found the error message appear on a running server after reboot from console.

Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

here's the boot info script result.

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marked as duplicate by bain, Alaa Ali, Eliah Kagan, Mateo, Warren Hill Aug 6 '14 at 12:11

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

    
I did some google and found it usually due to failed kernel update but I've never update or edit the cfg or settings. – Faifait May 22 '12 at 3:29
    
see askubuntu.com/questions/41930/… – gary May 26 '12 at 23:13

This appears to be a common problem. I believe I may have found a solution here: http://askubuntu.com/a/116959

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