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I had Windows 7 and Ubuntu both installed on my machine, but for some reasons I re-installed Windows 7, and now when the system starts, I can't see GRUB menu, which normally appears asking using for windows or ubuntu OS.

How to bring that menu back?

Thanks

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If you reinstalled windows, now you have its bootloader which conveniently doesn't detect Linux OS's, and not Grub.

To reinstall Grub, with all the options you had, you'll need a linux live CD or pen. Once in a "live session":

  1. Open a Terminal
  2. Use sudo fdisk -l and locate Ubuntu's partition.
  3. Mount said partition in /mnt (replace XY, with the correct letter & number):
    • sudo mount /dev/sdaXY /mnt
  4. Reinstall grub (assuming /dev/sda is your main HDD):
    • sudo grub-install --root-directory=/mnt/ /dev/sda
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It should definitively have be asked before, but cannot find a reference.

By the way, it is a normal situation, answered here.

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