In this video, I show you another, better way to reinstall the GRUB bootloader on Linux.

Prerequisites:
1. A Linux install media (any GRUB-based distribution with a live ISO should do)
THAT'S IT!

Commands used in this video:
Mount root partition: sudo mount /dev/sdXY /mnt (example: sudo mount /dev/sda3 /mnt)
Mount boot partition (if applicable): sudo mount /dev/sdXY /mnt/boot (example: sudo mount /dev/sda2 /mnt/boot)
Mount EFI System partition (if applicable): sudo mount /dev/sdXY /mnt/boot/efi (example: sudo mount /dev/sda1 /mnt/boot/efi)
Setup "bind" mounts:
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
Chroot into your Linux installation: sudo chroot /mnt
Reinstall GRUB (in chroot): grub-install /dev/sdX (example: grub-install /dev/sda)
Regenerate GRUB configuration file (in chroot): update-grub
Alternate "update-grub" command (for Arch Linux only): grub-mkconfig -o /boot/grub/grub.cfg
Exit chroot: exit

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