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I just reinstalled Windows 7 on my PC which erased my Master Boot Record and I can't boot into my Ubuntu 12.04 Precise Pangolin partition. The computer in question is an ultrabook, so I don't have a CD drive to boot from. Is there a way to repair the MBR from Windows?

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If you have a usb thumb drive, you can use penndrivelinux from windows to make it bootable with an applicable distribution. From there you can fix it using boot-repair.

Please see:

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