Several tutorials and how-to's on ask ubuntu re uefi booting refer to efibootmgr as being capable of controlling a uefi boot. In all cases I have seen the tutorial asks you to
How can this be done when the kernel module efivars.ko does not exist in any Ubuntu kernel that I can find. If you doubt me do these two things, firstly run the command
sudo modprobe -l | grep efivars
You will get no results. Next go to packages.ubuntu.com and enter the search term efivars.ko in 'search the contents of packages'. Again you will get no results.
Debian have kernels with this module in it and so to Arch. Ubuntu however do not. Or if they do they conceal them remarkably effectively.
Am I missing something - it is not unknown!