Can you dual boot Windows if Ubuntu is already installed? All of the sites I have found only work starting with Windows installed.
migrated from stackoverflow.com Apr 21 '12 at 13:00
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The reason most tutorials start with Windows and then install Ubuntu is that Windows installs its own bootloader that does not recognize Ubuntu as a valid OS. Fortunately, it is fairly easy to restore Ubuntu's bootloader, which does recognize Windows.
How I would do this:
See this Ubuntu Documentation article for more information.