I have two systems Ubuntu and Ubuntu (with Lethe). I would like to protect (first)Ubuntu in grub menu password. To you when you type a password only you get access to the system.


Here's a nice link to a documentation article on this (working for grub2, the version you should have) : https://help.ubuntu.com/community/Grub2/Passwords

Hope it helped.

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    Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Thomas Ward Oct 17 '16 at 2:54

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