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Recuperar GRUB2 després de moviments de particions

Per recuperar el GRUB2 ho farem a través d’una distribució Live{CD|USB} i utilitzant la comanda chroot.

Mount your normal system partition:

Substitute the correct partition: sda1, sdb5, etc.

sudo mount /dev/sdXX /mnt # Example: sudo mount /dev/sda1 /mnt

Only if you have a separate boot partition:

sdYY is the /boot partition designation (for example sdb3)

sudo mount /dev/sdYY /mnt/boot

Mount the critical virtual filesystems:

sudo mount –bind /dev /mnt/dev
sudo mount –bind /dev/pts /mnt/dev/pts
sudo mount –bind /proc /mnt/proc
sudo mount –bind /sys /mnt/sys
Chroot into your normal system device:

sudo chroot /mnt
If there is no /boot/grub/grub.cfg or it’s not correct, create one using

update-grub
Reinstall GRUB 2:

Substitute the correct device – sda, sdb, etc. Do not specify a partition number.

grub-install /dev/sdX

https://help.ubuntu.com/community/Grub2

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