How to Password Protect Ubuntu’s Boot Loader

“Ubuntu’s Grub boot loader lets anyone edit boot entries or use its command-line mode by default. Secure Grub with a password and no one can edit them — you can even require a password before booting operating systems.

Grub 2’s configuration options are split across multiple files instead of the single menu.lst file Grub 1 used, so setting a password has become more complicated

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