Then I guess /etc/grub.d/01_PASSWORD does not exist on my system because it was upgraded from Trisquel 3.5. Am I right?

I do not really see the point of this additional security. As soon as the local access includes a USB port (or a CD player), you can boot a Live system and read this file... I know that GRUB allows to encrypt the password, but Trisquel cannot both generate a random and encrypt it before the administrator knows it! :-)

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