
Is it possible to run grub-install without the chroot?

    https://www.gnu.org/software/grub/manual/grub/html_node/Installing-GRUB-using-grub_002dinstall.html

        "For removable installs you have to use --removable and specify both --boot-directory and --efi-directory:

            # grub-install --efi-directory=/mnt/usb --boot-directory=/mnt/usb/boot --removable"

