First time this happened! A coworker asked me today how to get into his Linux Mint box after he forgot his password. Of course I rattled off the old GRUB way to get things done, but, what?? This is GRUB 2! No so fast there! Turns out it’s quite different.

You hold down the shift key while booting to get to the grub menu.
You hit ‘e’ to edit your boot options.
You change the kernel line options on the very end of the kernel line to read “rw init=/bin/bash”.
You press F10 to boot.

Once booted you are dropped immediately into a shell prompt where you can change your password with the “passwd username” command. Reboot and you’re home free!