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For some reason if the Master Boot Record (MBR) is overwritten or corrupted, here is a simple HOW-To to install GRUB (GRand Unified Boot loader) as the boot loader with Ubuntu being the host operating system.

1. Boot up Linux using Ubuntu Live CD
   
   
2. Run grub with system user privileges
   

   % sudo grub
   Password:
   
   Probing devices to guess BIOS drives. This may take a long time.

   
   
3. Locate the grub files on the connected devices.
   

   grub> find /boot/grub/stage1
    (hd0,0)

   
   
4. Even though the above example shows only one location, it is not uncommon for grub to find multiple locations when multiple operating systems are installed on a system. In that case, choose the one that corresponds to the partition where Linux is installed.
   

   grub> root (hd0,0)

   
   
5. Finally install the grub boot loader on the primary HDD by running 'setup'.
   

   grub> setup (hd0)
    Checking if "/boot/grub/stage1" exists... yes
    Checking if "/boot/grub/stage2" exists... yes
    Checking if "/boot/grub/e2fs_stage1_5" exists... yes
    Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  17 sectors are embedded.
   succeeded
    Running "install /boot/grub/stage1 (hd0) (hd0)1+17 p (hd0,0)/boot/grub/stage2
   /boot/grub/menu.lst"... succeeded
   Done.

After restarting the system, GRUB menu should appear during the system startup.
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Linux | Ubuntu | GRUB

Posted by: Giri Mandalika.    # 7:55 PM Tweet