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Assume drive is attached or you are in a livecd.
Assume we are mounting it to /media/sda1
What is happening is that we are mounting enough of our local file system to enable the chroot environment to emulate what grub requires to operate.
:: Code ::mount /dev/sda1 /media/sda1
mount --bind /proc /media/sda1/proc
mount --bind /dev /media/sda1/dev
mount --bind /sys /media/sda1/sys
if you need to reinstall grub to partition boot sector, or to mbr, do this instead of update-grub:
:: Code ::# to install to partition root, let's say it's /dev/sda1
grub-install --force /dev/sda1
# or, if you want to install to MBR, main boot menu that is:
Before you run update grub, after you've mounted and chrooted, you might also want to add, to: /etc/default/grub
if you don't want all the other operating systems on the computer to show, this is useful for systems where you boot from one master mbr grub, which has all the os install choices, and then each sub os boots from partition root, where you don't need to see the other os'es
Edit this before running update-grub
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This has saved me a number of times, while I grind my teeth.
Grub2 tends to do that.
Thanks once again, this will help a bunch of people.
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