efi

instalar o mokutil:
apt install mokutil

verificar se o secureboot foi ativado:
mokutil --sb-state

desativar o secureboot:
mokutil --disable-validation

ativar o secureboot:
mokutil --enable-validation

https://wiki.debian.org/SecureBoot

https://askubuntu.com/a/831241

https://www.linuxbabe.com/command-line/how-to-use-linux-efibootmgr-exam…

https://www.ordinatechnic.com/general-guides/1/Bootloaders/2/GRUB/grub-…

https://unix.stackexchange.com/a/623076

https://askubuntu.com/a/657303

http://www.rodsbooks.com/linux-uefi/