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I have installed Ubuntu 12.04 (x64) LTS (from Windows 7) in a dual boot setup.

I allocated 30 GB disk space for Ubuntu is, now it's full.

How can I extend the disk space available to Ubuntu beyond 30 GB?

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You can boot into a live session and use gparted to resize the partition. Make sure you backup your data first. I have done this quite a few times with no errors at all but better safe than sorry.

You can download a GParted live CD here.

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