EsauPR/grub_recovery.md

Created June 21, 2017 23:42

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Ways to restore grub

Raw

grub_recovery.md

Grub Recovery

From system [1]

$ mount /dev/sdaX /mnt
$ mount --bind /dev /mnt/dev
$ mount --bind /dev/pts /mnt/dev/pts
$ mount --bind /proc /mnt/proc
$ mount --bind /sys /mnt/sys
$ chroot /mnt
$ grub-install --boot-directory=/boot/ --recheck /dev/sda

From system [2]

$ mount /dev/sdaX
$ grub2-install --boot-directory=/mnt/boot/ --recheck /dev/sda
$ grub2-mkconfig -o /mnt/boot/grub2/grub.cfg

From Grub cli

Inside grub cli

$ set root=(hdX,XxXxXx)
$ linux /vmlinux_XXXXX root=/dev/sdaX
$ initrd /initrd_XXXXXX
$ boot

On system
```
$ grub-install /dev/sdaX
$ update-grub
```

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