Not certain about endeavour but i know mint grub cant boot manjaro but manjaro can boot mint. If its the same on endeavour then what id do is use an endeavour live usb to boot and then chroot to install/update grub.
Not certain about endeavour but i know mint grub cant boot manjaro but manjaro can boot mint. If its the same on endeavour then what id do is use an endeavour live usb to boot and then chroot to install/update grub.