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I have a 80Gb HDD with one partition for Ubuntu and want to partition it into two partitions 60G/20G.

How can I do this?

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Please edit your answer and tell us if this is a dual boot system or not and if it is what will you be booting besides ubuntu. –  Wild Man Oct 22 '13 at 4:22

3 Answers 3

Note: Make sure that the drive is empty; otherwise make sure that you have a complete backup of its content, because creating a partition will erase all data on the drive.

Open Dash, and search for Gparted, and click on it. If its not installed, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo apt-get install gparted

Once installed open the application, and enter your password. Once it open, follow the step below:

If the drive is new, Click on Device, and choose Create Partition Table; otherwise skip to the step in the third image.

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Keep the Default, and click Apply

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Right click on the Unallocated space, and choose New

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Create a 60GB partition. Once you enter all the info, click Add

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Then Right click on the Unallocated space, and choose New

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Create a 20GB partition. Once you enter all the info, click Add

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Click on the Green check mark to Apply pending operations

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And just click Apply to start.

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Once done, just click Close, and that's it.

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Creating a partition doesn't necessarily "erase all data on the drive". One can normally shrink an existing partition to leave unallocated space and create a new partition in this space. Your example actually creates a partition table - which is a different story. –  CentaurusA Oct 20 '13 at 20:40
    
You're right in a way. The OP has a drive that she/he want to create 2 partitions. Without knowing any other details, creating these partitions will erase all data on the drive, hence the answer would be the correct way to create the partitions. –  Mitch Oct 21 '13 at 6:43

Use a Live-CD with Gparted to shrink the 80 GB partition to 60 GB and then create a 20 GB partition in the unallocated space that the shrinking procedure creates.

Information on the use of Gparted, plus a number of references to how-to sites and video tutorials, can be found at: http://linuxnorth.wordpress.com/manual-partitioning/

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You cannot partition your drive unless you unmount it(and you cannot unmount that partition which has the current OS installed on it). So make a bootable disk/usb stick first, then boot-in from it and try the "G-Parted partition editor" and partition your drive however you want :)

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