pi@raspberrypi:~ $ systemctl status unifi.service
● unifi.service - unifi
Loaded: loaded (/etc/systemd/system/unifi.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2018-11-29 20:31:53 CET; 21min ago
Process: 757 ExecStart=/usr/lib/unifi/bin/unifi.init start (code=exited, status=1/FAILURE)
Nov 29 20:31:52 raspberrypi unifi.init[757]: unifi cannot start. Please create unifi user, and chown -R unifi /var/
Nov 29 20:31:52 raspberrypi systemd[1]: Failed to start unifi.
Nov 29 20:31:52 raspberrypi systemd[1]: unifi.service: Unit entered failed state.
Nov 29 20:31:52 raspberrypi systemd[1]: unifi.service: Failed with result 'exit-code'.
Nov 29 20:31:53 raspberrypi systemd[1]: unifi.service: Service hold-off time over, scheduling restart.
Nov 29 20:31:53 raspberrypi systemd[1]: Stopped unifi.
Nov 29 20:31:53 raspberrypi systemd[1]: unifi.service: Start request repeated too quickly.
Nov 29 20:31:53 raspberrypi systemd[1]: Failed to start unifi.
Nov 29 20:31:53 raspberrypi systemd[1]: unifi.service: Unit entered failed state.
Nov 29 20:31:53 raspberrypi systemd[1]: unifi.service: Failed with result 'exit-code'.