Harry Putnam:
What tools do we have for setting services to run levels
As of Debian 8, you are using a systemd operating system. Forget about runlevels. They are, as the systemd doco says several times over, "obsolete".
* https://unix.stackexchange.com/a/196014/5132 * https://unix.stackexchange.com/questions/210117/ * https://unix.stackexchange.com/a/394238/5132 * http://jdebp.eu./FGA/inittab-is-history.html