Active Partition Recovery Full -
From Windows PE command prompt:
diskpart select disk 0 select partition 1 active exit After restoring structure, check for file system corruption: active partition recovery full
# Mount root partition mount /dev/sda1 /mnt # Reinstall GRUB grub-install --root-directory=/mnt /dev/sda update-grub Using fdisk (Linux): From Windows PE command prompt: diskpart select disk