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I recently installed Ubuntu on a new hard drive. I did not perform any partitioning operations during installation. After the installation and upgrade, I tried to partition the drive in which Ubuntu was installed.

  • Partition: /dev/sda2
  • File System: ext4
  • Mount Point: /

I am not able to create another partition from this one. Is it possible to do it or should I have to live with one BIG partition?

The option to resize this partition is greyed out.

What happens if I try to unmount this partition?

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What you are trying to do is to shrink the running system partition of Ubuntu.

That is like to ask a surgeon to give himself a double bypass... ;-)

Boot the Ubuntu Live CD or the gparted live CD and then repartition!

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Check the link, which will help you to resize the drive partition and to create an extended partition. From the resized partition you can create a primary or an extended partition:

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You are doing this using fdisk command you can do major operation with disk-drive

For a step-by-step guide refer to this link: How to use fdisk to manage partitions on Linux

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