grub-efi-arm64 software package provides GRand Unified Bootloader, version 2 (ARM64 UEFI version), you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install grub-efi-arm64
grub-efi-arm64 is installed in your system.
Make ensure the grub-efi-arm64 package were installed using the commands given below,
$ sudo dpkg-query -l | grep grub-efi-arm64 *
You will get with grub-efi-arm64 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Administration Utilities |
| Package | grub-efi-arm64 |
| Version | 2.02~beta2-36ubuntu3 |
| Description | GRand Unified Bootloader, version 2 (ARM64 UEFI version) |
| Sub Section | admin |