[ubuntu] Resizing linux partition

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http://ubuntuforums.org – Hello! I have Ubuntu 13.04 installed on my (almost) my whole hard drive..and I would like to resize the main partition so I could install Windows 7 as well The problem is..when using GParted (haven't tried anything else) I can't resize it. I tried to swapoff the swap partition and I still couldn't resize it. Here's a screenshot of my current partition: Thank you! (Hardware)