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I am using Ubuntu 12.04 and Windows 7 on my laptop, where I had installed Ubuntu alongside Windows. Now, I would like to, if I can, upgrade to Windows 8 without any formatting. How would that affect the booting process? Would it cause any problems with Ubuntu 12.04?

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I can't respond you how to upgrade Windows, but I can tell you that may be this procedure will modify the MBR, in such case you will need to repair the GRUB –  Lucio Dec 29 '12 at 16:58
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If you UPGRADE your windows, it will not be problem. What I experienced about windows 7 to 8 installation is this:

You can upgrade Windows 7 32-bit to Windows 8 32-bit only. -32-bit to 64-bit is not possible in upgrade process. -You have to buy a saperate DVD to go from 32-bit to 64-bit.

This UPGRADE should not modify MBR and you will be able to keep Ubuntu as it is.

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