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I am installing Ubuntu 13.04 on a computer that has Windows 7 already installed. I do not want to wipe it, so I took space from it, and made a new partition. I am doing this from a disk image that I burned this morning. All is fine up to this point. I then clicked the "Install Now" button. A dialog box popped up, saying the following: "No root file system is defined. Please select correct this from the partition menu."

What is going on? What am I doing wrong? What should I do to fix this?

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Could you take a screenshot of the window? Also, you might take a screenshot of the previous step. –  Braiam Sep 30 '13 at 1:46

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Use this video to help. I installed ubuntu from this video. Hope it works!!! https://www.youtube.com/watch?v=xK8X7_tYWmA

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You can ignore anything before 1:30 because you seem to have gotten there already. –  David Foerster Sep 29 '13 at 22:14

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