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Is there a partition utility in Ubuntu from which I can break my existing 'ext4' partition into more partition w/o loosing this partition's data?enter image description here

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possible duplicate of askubuntu.com/q/51272/4982 –  Mark Rooney Mar 6 '12 at 12:06
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You can with gparted it is part of ubuntu. Be sure to resize that partition first (shrink it) and freespace that left will be turned in unallocated space. Make new partition from that unallocated space. You can shrink it with graphic slider.

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the partition that i need to resize has the filesystem, on gparted this partition is not showing the option of 'resize' whereas other small partition does. Moreover it is showing an option of 'unmount' is it safe to unmount the drive when it has the ubuntu file system? –  Firdous Mar 6 '12 at 10:40
    
Gparted should show option "resize/move" and shouldn't show option "unmount". If you have installed Windows run chkdsk for file system errors. Don't click on unmount im meantime. Are yoou running ubuntu from live media or you instaled it previously on hard drive? –  ubi Mar 6 '12 at 10:49
    
windows is not install, i have yet to install windows, the partition is flaged 'boot' and is not showing 'resize/move'. The only available options are 'Unmount' and 'Manage flags' –  Firdous Mar 6 '12 at 10:59
    
ubuntu is installed on a hard drive –  Firdous Mar 6 '12 at 11:05
    
can you upload printscreen of your gparted screen. im intrested how bar that shows partitions look alike –  ubi Mar 6 '12 at 11:12
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you can use gparted which can be installed by typing into a terminal

"sudo apt-get install gparted" (without quotes)

and then by either pressing alt-f2 or in a terminal write "gksudo gparted" (without quotes)

gparted help is located here http://gparted.sourceforge.net/help.php


edit: read your modification to the question.

you have to unmount the partition to edit it. also you may use a live cd/usb to edit the partition, too. with same steps.

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