[14:26] I would like to report my experience based on an Ubuntu community documentation[Grub2/Passwords : https://help.ubuntu.com/community/Grub2/Passwords] [14:26] Under the section Protecting Menuentries, it's mentioned : Superuser Only: menuentry 'Ubuntu, with Linux 3.2.0-24-generic' --class ubuntu -class os --users { [14:26] I tried this, but was grub showed me an error while booting [14:26] On enquiring in #grub channel, I came to know that the --users option expects an argument , and should actually be --users '' { [14:26] This solved my issue. I think the documentation needs to be updated ? [14:26] I was on a debian machine btw