Enabling user logins
Depending on your distribution, you need a systemd instance unit, an Upstart job file, or an entry in /etc/inittab to facilitate user logins.
About this task
A full discussion of systemd instance units, inittab entries, or Upstart job files for starting login programs is beyond the scope of this publication. You can use the examples that follow as a starting point. For more information, see the systemd, events, init, or inittab man pages.