[ubuntu] Should I install Ubuntu or Backtrack first?

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http://ubuntuforums.org – I am planning on having a triple boot setup on my laptop with Windows 7 (soon 8), Ubuntu, and Backtrack. I have read up on setting up dual and triple boot systems, and it seems like some operating systems like to replace the existing GRUB with their own bootloader. Both Backtrack and Ubuntu use GRUB for multi-boot installations. Does it matter what order I install them in? Right now the computer only has Windows on it. (Hardware)