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Can you dual boot Windows if Ubuntu is already installed? All of the sites I have found only work starting with Windows installed.

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migrated from stackoverflow.com Apr 21 '12 at 13:00

This question came from our site for professional and enthusiast programmers.

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:

  1. (before installing Windows) repartition the disk in Ubuntu (Windows needs at least 20 GB)
  2. install Windows
  3. boot into the Ubuntu LiveCD
  4. install and run Boot-Repair

See this Ubuntu Documentation article for more information.

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