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I'm currently using Windows 8 64-bit OS and I want to use ubuntu alongside it. But while I try to install, I'm always stuck on an error message No root file system defined

I've even tried to use gpart but I've no idea what to do there. I'm completely new to ubuntu and linux.

I don't want to lose windows or any of my data.

I've a 20 GB partition which I've thought of using to install ubuntu. Any help would be highly appreciated!

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Are you using something else option while installing? – M.Tarun Sep 24 '13 at 13:10

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