Solved by reading, this two links :
https://www.gnu.org/software/grub/manual/html_node/Security.html
http://daniel-lange.com/archives/75-Securing-the-grub-boot-loader.html
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
--
You received this bug notification because you are a member
** Information type changed from Private Security to Public
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1314127
Title:
Secure Grub2 "edit" menu also secures booting
To manage notifications about
