Password Protect Your Grub2 with Grubpass on Ubuntu/Linux Mint 
In the Linux Mint Terminal enter:
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sudo dpkg -i grubpass.deb
Now start Grubpass with following command:
Note: There is no echoing when you type in your Grub2 password [enter] and repeat password [enter] so keep that in mind. You also might want to choose to Protect OTHER OSes [OSS] Command if you have a dual-boot OS feature to first test your new Grub2 user/password feature. After satisfying yourself on it's function then you might then wish to chose the 'all' command for maximum security.
Couple this feature with setting your Bio's Password and forcing your computer or laptop to boot-up 1st. with your hard-drive to effectively cut-off common attempts by a thief booting up another OS to bypass your Linux-Mint password protected system.