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> How to re-install Grub bootloader after Windows re-install on a dual-boot system
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Romeo29
post Jul 26 2009, 07:46 PM
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How to add Grub bootloader after Windows re-install on a dual-boot system


Guide Overview :
You have a dual boot system with Windows and Linux both on separate partitions. You decide to format the Windows partition and re-install Windows after a malware attack or just because Windows got too much cluttered. The Windows setup re-writes the MBR of primary partition so after re-installing Windows, you no longer have Grub loader and you can no longer boot into Linux. This guide tells you how to re-install Grub bootloader after reinstalling Windows on a dual boot system.

Requirements :
A bootable Linux live CD. For example, a Ubuntu CD. http://www.ubuntu.com/GetUbuntu/download

Instructions :
  1. Boot from the Live Linux CD.
  2. Choose an option that says something like "Try Linux without installing".
  3. After Linux desktop environment (like Gnome or KDE) is finished loading, open a Terminal window.
    Under Gnome, open Terminal through, Applications menu -> Accessories -> Terminal.
    Under KDE, open Terminal through, KMenu -> System -> Terminal Program (Konsole).
  4. In the terminal, type sudo grub.
  5. Next type, find /boot/grub/stage1 and press Enter. The output may look like hd0, 6
  6. Type root (hd0, 6). Note that we have to use whatever output we get from previous command. If you get hd0, 2, then type root (hd0, 2)
  7. Type setup (hd0) (again replace hd0 with the output of the find command) and press Enter. next type quit and press Enter to exit grub.
  8. Thats it, Grub bootloader is loaded again in MBR. Restart your computer.


This post has been edited by Amazing Andrew: Jul 29 2009, 12:08 PM
Reason for edit: Added parenthetical, just to be safe :) - AA


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