Install grub-efi-amd64-signed by entering the following commands in the terminal:
sudo apt update sudo apt install grub-efi-amd64-signed
Description:
GRand Unified Bootloader, version 2 (EFI-AMD64 version, signed)
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 built for use with the EFI-AMD64 architecture, signed with Canonical's UEFI signing key.
Version: 1.93+2.02-2ubuntu8
Section: utils