Uninstall Windows after Installing Ubuntu WITH Windows?

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http://askubuntu.com – Would it be possible to somehow uninstall Windows after installing Ubuntu with wubi.exe? So I install Ubuntu using Windows, but then REMOVE Windows and add GRUB so the computer boots up TO ONLY Ubuntu afterwards? I am having a hard time with using USB or CD's, and wubi seems to be the easiest method. Any help is appreciated:) (HowTos)