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I wanted to resize (increase or decrease the partition size) the existing Ubuntu partition without affecting it and the other OS(es) installed in the machine.

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Resize in what manner? Increase size of partition? Decrease size? If you want to increase, did you resize the other OS' partitions to make free space for the system to expand the Ubuntu partition onto? – Thomas W. Aug 24 '11 at 21:56
wanted to increase partition size; the other os has got some more unused memory space; – user7044 Aug 24 '11 at 21:59
You can use "largest continous space" – alexy13 Aug 24 '11 at 22:00
@user7044 by "unused memory space" what do you mean? Free space on the partition? Unallocated drive space on the drive itself (i.e. not partitioned)? If you mean the first (free space on the partition), you'd still need to resize that partition in order to be able to free up that unused space on the partition so the other partition you're expanding can use it. – Thomas W. Aug 24 '11 at 22:07
@alexy13 They already have Ubuntu installed, so selecting "largest continuous space" won't help. – Thomas W. Aug 24 '11 at 22:07

You can resize a Windows (NTFS) partition from Ubuntu using GParted. You'll need to shrink the partition to free up some unallocated space on the drive. Then you will be able to create a new Linux partition in that space.

GParted is not installed by default, look for it in the Software Center or install it in therminal by doing

sudo apt-get install gparted   

It won't be possible to modify your Ubuntu root partition (or, more precisely, any partition which is in use) while booted in Ubuntu. To do this, boot from Ubuntu Live CD and run GParted from there.

Make sure you have a backup of your important data before proceeding because it's a potentially dangerous operation.

You can find more documentation on GParted here:

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Will it be less dangerous if the two OS's are installed in separate drives, while the PC is still in dual boot mode? – RestlessC0bra Jun 18 at 12:12

You can re-size partitions, provided they are not in use mounted when you do so.

It will probably be easier to do this after booting up using a live disk. Not into your installed system.

As this is risky you should make sure you have a back up before you begin. I lost a whole system due to a power out-age do this. You have no excuses for not having back ups if some thing goes wrong.

You may need to install additional file systems tools such as ntfs-tools if you want to re-size partitions other then ext2/3/4.

Lots of good documentation on using Gparted can be found here.

With this document giving you step for step instructions on how to re-size a partition. With nice screen shots.

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