$ sudo apt-get update
$ sudo apt-get install efibootmgr 

efibootmgr is installed in your system.

Make ensure the efibootmgr package were installed using the commands given below,

$ sudo dpkg-query -l | grep efibootmgr *

You will get with efibootmgr package name, version, architecture and description in a table

efibootmgr package basic information: