How To Reset Root Password on Ubuntu 16.04

1. Edit Grub Menu with press "e"

2. Find the line "linux" and add script below at the end of that line

rw init=/bin/bash

3. Mount with to see read/write flags

root@(none):/# mount | grep -w /

4. Reset Password with command below

root@(none):/# passwd

5. Reboot your system

root@(none):/# exec /sbin/init