I accidentally restored BIOS on my dell Inspiron 5559 which was dual booting earlier with Windows 10 and Ubuntu-16.04. After restoring BIOS, GRUB got deleted which I repaired using 'boot-repair' . I restarted the system and GRUB successfully loaded. I wanted to make sure that windows was okay or not so I booted in the windows. Problem arose when I restarted from windows. GRUB was nowhere to be seen after restarting from windows. Please help!

  • Get a usb with a live OS installation.
  • Boot into Rescue mode
  • Run these following commands to install grub onto your hardrive.


    grub-install /dev/sdX

After these steps you should be able to boot into grub.

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