In SLES 11 I could boot with parameter init=/bin/bash, mount / rw and reset root password, then enter "reboot" and root's password was changed. In SLES 12.2 I can add the init=/bin/bash parameter and get to a "#" prompt, and also enter the same commands, but I cannot successfully "reboot" -- I must be missing something, because when I try to enter the command to reboot, or "init 6" the command interpreter returns information that those are privileged commands and must be entered by root. However, I am logged in as root at the time. What would be the correct sequence of commands to carry out the well-known procedure for resetting root's password as was possible in SLES 11?

Thank you for any guidance.