simone@simone-desktop:~$ sudo su
root@simone-desktop:/home/simone# modprobe efivars
root@simone-desktop:/home/simone# exit
exit
simone@simone-desktop:~$ sudo efibootmgr -v
Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.
Try 'modprobe efivars' as root.
simone@simone-desktop:~$