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Is there a way to move the grub to a new partition, or drive in linux in the grub rescue, or the live mode?

cnx223
  • 55

2 Answers2

7

Yes, this can be done. The command is grub-install and its syntax is like so:

grub-install [OPTION...] [OPTION] [INSTALL_DEVICE]

Since you asked for a live media recovery, here's a procedure from this tutorial:

Boot the Ubuntu Live CD.

Press Ctrl-Alt-F1

sudo mount /dev/sda1 /mnt

sudo mount --bind /dev /mnt/dev

sudo mount --bind /proc /mnt/proc

sudo mount --bind /sys /mnt/sys

sudo chroot /mnt

Now the fun stuff. Lets say I want grub to be on /dev/sda2, I'd run sudo grub-install /dev/sda2 or alternatively sudo grub-install /dev/sda to be partition/OS independent

Sergiy Kolodyazhnyy
  • 107,582
0

My answer to move the default boot to another disk, which is hard to find on the web:

Assume you boot from /dev/sda2 and you want to boot by default from /dev/sdb2. This without bothering/counting menuentries in /boot/grub.cfg, then:

  1. update-grub
  2. reboot, and select the partition you want to boot from (say /dev/sdb2).
  3. when booted, do update-grub again. this will make the current booted partition the primary boot partition.
  4. for added luck, do

a) install-grub /dev/sda

b) install-grub /dev/sdb

Now , if you ever pull drive /dev/sda , some bootable grub remains.

Happy booting!

vkersten
  • 161