`sudo /etc/init.d/apache2 restart` or `service apache2 restart`

Job for apache2.service failed.  See "systemctl status apache2.service" and "journalctl -xe" for details.

apache2.service - LSB: Apache2 web server
   Loaded: loaded (/etc/init.d/apache2)
   Active: failed (Result: exit-code) since Thu 2015-08-27 21:18:25 PDT; 3min 1s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 20754 ExecStop=/etc/init.d/apache2 stop (code=exited, status=0/SUCCESS)
  Process: 20863 ExecStart=/etc/init.d/apache2 start (code=exited, status=1/FAILURE)

`Defined-By: systemd
 Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

 Unit cups.service has begun shutting down.
Aug 28 22:54:20 ubuntu systemd[1]: Started CUPS Scheduler.
 Subject: Unit cups.service has finished start-up
 Defined-By: systemd
 Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

 Unit cups.service has finished starting up.

 The start-up result is done.
Aug 28 22:54:20 ubuntu systemd[1]: Starting CUPS Scheduler...
 Subject: Unit cups.service has begun start-up
 Defined-By: systemd
 Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
 Unit cups.service has begun starting up.
Aug 28 22:54:28 ubuntu anacron[653]: Job `cron.daily' terminated
Aug 28 22:54:28 ubuntu anacron[653]: Job `cron.weekly' started
Aug 28 22:54:28 ubuntu anacron[3642]: Updated timestamp for job `cron.weekly' to
Aug 28 22:54:29 ubuntu anacron[653]: Job `cron.weekly' terminated
Aug 28 22:54:29 ubuntu anacron[653]: Normal exit (2 jobs run)`