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Possible Duplicate:
How do I install Windows 7 alongside a pre-existing Ubuntu installation?
Resizing my linux partition

I want to partiton my hard drive so I can dualboot Windows 7. I already installed Ubuntu as my only OS. I tried GParted from the software center but I can't unmount the main Ubuntu partition. Help please?

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marked as duplicate by James Henstridge, Jorge Castro, izx, jokerdino, Eliah Kagan Aug 14 '12 at 21:45

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

If you want to resize your Ubuntu partition with GParted, you cannot run GParted from the installed Ubuntu system.

Therefore, you should use a live Ubuntu CD or USB key to boot into it and then resize your partition and make a new one for windows. Theres is a guide here: Resizing my linux partition

You will probably have to use the live Ubuntu to fix the bootloader after installing Windows: Recovering Ubuntu After Installing Windows

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