Originally Posted by shadolink
My friend has told me that if I unmount the main partition and also cut the space starting from the end of the drive it will work. however on gparted live cd the option for unmounting doesn't even come up,what should I do?
If your using the Live Version of Gparted your only mounted to that particular partition long enough to modify it. As soon and you make the changes to the partition click apply changes.
Gparted will automatically mount (while you are working on the partition) and unmount (when you apply the changes) that partition for you.