Grub fails after update

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chroot steps in garuda linux

from live garuda usb

sudo mkdir /mnt

sudo mount /dev/sdxy /mnt

sudo garuda-chroot /mnt/@

now you should be chrooted in garuda

if the system is installed in legacy bios

then do the following in the chroot

grub-install /dev/sda

if its installed on efi

first mount the efi partition ie fat32 partition
from inside the chroot

mount /dev/sdxy /boot/efi

then

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=garuda --recheck

then update the grub

update-grub

exit the chroot with

exit
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