Install gnu-efi by entering the following commands in the terminal:
sudo apt update sudo apt install gnu-efi
Description:
Library for developing EFI applications
GNU toolchain for building applications that can run in the environment presented by Intel's EFI (Extensible Firmware Interface). EFI is a firmware specification for the "BIOS" on ia64(IPF), IA-32(x86) and x86_64 systems.
Homepage: http://sourceforge.net/projects/gnu-efi/
Version: 3.0.4-2
Section: devel