How can I install Ubuntu and replace Windows without a flash drive or burning a CD?
Can I use an external hard drive?
If so, what would be the procedure?
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Dustin, you do need a flash drive or DVD/CD if you want that, and it is definitely a worthy investment and these days isn't expensive at all. Even after installing Ubuntu and replacing Windows 7 with Ubu (good decision from your part!), you always have a Live image to boot your PC,if anything would happen, or other PCs with to show others without installing, or write future releases of Ubuntu onto the medium!
You can install Ubuntu on top of Windows using the following procedure:
If you install Wubi from http://www.ubuntu.com/download/desktop/windows-installer
This installs ubuntu inside windows and then migrate wubi to a partition instructions in link below
remember to restore the grub for ubuntu , other wise it may cause some problem during boot up of the ubuntu u install http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a-ubuntu-live-cd