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I have 4 OSes installed:

Windows XP on sda1
Backtrack on sda5-6
Ubuntu 11.04 on sda7-8
Ubuntu 10.10 on sda9-10

I want to remove Ubuntu 11.04 (partitions sda7-8). I tried using GParted from Ubuntu 10.10, but it says that I have to unmount logical partitions with a number higher than the one being removed.

What can I do?

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you should post the exact message gparted gives, word for word. Also post the output of "sudo fdisk -l /dev/yourdiskdevice". Just edit your existing question. – CarlF Jun 12 '11 at 20:25
up vote 0 down vote accepted

I think I would try to boot to a USB with Ubuntu 10.10 on it. Or use EASEUS Partition Master Home Edition in windows XP.

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An alternative would be using gparted from Backtrack.

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