etherpad@bis016:/etc/systemd/system$ sudo systemctl enable etherpad-lite
Synchronizing state of etherpad-lite.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable etherpad-lite
update-rc.d: error: etherpad-lite Default-Start contains no runlevels, aborting.

Description=etherpad-lite (real-time collaborative document editing)
After=syslog.target network.target

[Service]
Type=simple
User=etherpad
Group=etherpad
Environment=NODE_ENV=production
ExecStart=/home/etherpad/etherpad-lite/bin/run.sh

[Install]
WantedBy=multi-user.target

-rwxr-xr-x 1 etherpad etherpad  283 May 22 18:09 etherpad-lite.service

etherpad@bis016:~/etherpad-lite/bin$ pwd
/home/etherpad/etherpad-lite/bin

#!/bin/sh
### BEGIN INIT INFO
# Provides:          Etherpad-lite
# Required-Start:    $all
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Realtime editor
### END INIT INFO