add options: linux init=/bin/bash
2) Boot linux, you will then be taken to a '#' prompt as root.
3) Edit /etc/passwd with: vipw
Remove the 'x' in the root entry representing the pasword (2nd field)
4) Sync the /etc/passwd file with the /etc/shadow file with: pwconv
5) Now, reset the root password with: passwd root
6) Reboot