Install grub-efi-amd64 by entering the following commands in the terminal:
sudo apt update sudo apt install grub-efi-amd64
Description:
GRand Unified Bootloader, version 2 (EFI-AMD64 version)
GRUB is a portable, powerful bootloader. This version of GRUB is based on a cleaner design than its predecessors, and provides the following new features: . - Scripting in grub.cfg using BASH-like syntax. - Support for modern partition maps such as GPT. - Modular generation of grub.cfg via update-grub. Packages providing GRUB add-ons can plug in their own script rules and trigger updates by invoking update-grub. . This package contains a version of GRUB that has been built for use with EFI-AMD64 architecture, such as the one provided by Intel Macs (that is, unless a BIOS interface has been activated).
Homepage: http://www.gnu.org/software/grub/
Version: 2.02-2ubuntu8
Section: admin