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I have an old Windows laptop on which I've installed Ubuntu. At least, that's what I thought.

I created a USB Boot disk by following this online guide and completely whipped out my hard drive to install Ubuntu on it. All goes according to plan, except when I try to boot my laptop.

I only get the message "Operating System not found". But when I boot from my USB flash again, I get the warning Ubuntu 12.0.4 is already installed and will be overwritten.

I've run the Boot-Repair and came up with this result.
I'm fairly new to Linux, so I'm not entirely sure what it al means... How can I boot my Ubuntu installation on this machine?

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Does boot-repair works or not? –  Avinash Raj Nov 6 '13 at 12:20
    
When I boot from my installation flash drive, yes. If I try to boot without the flash drive, I get the error "Operation System not found"-error... –  Michiel Nov 6 '13 at 13:52

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