Original content was found [[https://srvfail.com/reset-root-password-debian-8/|here]].

  * Boot to grub
  * Look for the line starting with

  /boot/vmlinuz

  * Add this to the end of that line (after quiet)

  init=/bin/bash

  * Hit F10 to boot
  * remount read-write with

  mount -n -o remount,rw /

  * Use passwd command to reset password
  * reboot