OK @makerken thanks for your reply!
I checked these points:
List all files:
pi@raspberrypi:~ $ ls -la
total 156
drwxr-xr-x 29 pi pi 4096 Mar 30 00:28 .
drwxr-xr-x 3 root root 4096 Mar 13 22:55 ..
-rw------- 1 pi pi 2679 Mar 31 18:11 .bash_history
-rw-r--r-- 1 pi pi 220 Mar 13 22:55 .bash_logout
-rw-r--r-- 1 pi pi 3523 Mar 13 22:55 .bashrc
drwxr-xr-x 7 pi pi 4096 Mar 28 23:43 .cache
drwx------ 8 pi pi 4096 Mar 28 23:06 .claws-mail
drwx------ 18 pi pi 4096 Mar 29 01:44 .config
drwx------ 3 pi pi 4096 Mar 14 00:23 .dbus
drwxr-xr-x 2 pi pi 4096 Mar 30 00:10 Desktop
drwxr-xr-x 4 pi pi 4096 Mar 28 23:47 Documents
drwxr-xr-x 2 pi pi 4096 Mar 14 00:18 Downloads
-rw------- 1 pi pi 4118 Mar 28 23:26 example.txt:.save
drwx------ 2 pi pi 4096 Mar 28 23:53 .gconf
drwx------ 3 pi pi 4096 Mar 28 18:01 .gnome
drwx------ 3 pi pi 4096 Mar 14 00:18 .gnupg
-rw-r--r-- 1 pi pi 80 Mar 28 21:07 .gtkrc-2.0
drwxr-xr-x 4 pi pi 4096 Mar 29 01:44 .homebridge
drwxr-xr-x 3 pi pi 4096 Mar 13 23:41 .local
drwxr-xr-x 2 pi pi 4096 Mar 14 00:18 Music
drwxr-xr-x 2 pi pi 4096 Mar 28 23:25 .nano
drwxr-xr-x 4 pi pi 4096 Mar 29 02:00 .npm
drwxr-xr-x 2 pi pi 4096 Mar 14 00:43 .oracle_jre_usage
drwxr-xr-x 2 pi pi 4096 Mar 14 00:18 Pictures
drwx------ 3 pi pi 4096 Mar 14 00:47 .pki
-rw-r--r-- 1 pi pi 675 Mar 13 22:55 .profile
drwxr-xr-x 2 pi pi 4096 Mar 14 00:18 Public
drwxr-xr-x 2 pi pi 4096 Mar 13 23:41 python_games
drwxr-xr-x 2 pi pi 4096 Mar 14 00:18 Templates
drwxr-xr-x 3 pi pi 4096 Mar 14 00:18 .themes
drwx------ 4 pi pi 4096 Mar 28 18:23 .thumbnails
drwxr-xr-x 2 pi pi 4096 Mar 14 00:18 Videos
drwx------ 3 pi pi 4096 Mar 28 20:37 .vnc
drwxr-xr-x 3 pi pi 4096 Mar 14 00:43 .Wolfram
drwxr-xr-x 11 pi pi 4096 Mar 14 00:43 .WolframEngine
-rw------- 1 pi pi 56 Mar 30 00:28 .Xauthority
-rw------- 1 pi pi 3955 Mar 30 00:28 .xsession-errors
-rw------- 1 pi pi 3955 Mar 29 23:59 .xsession-errors.old
Where is Homebridge located?
pi@raspberrypi:~ $ which homebridge
/usr/bin/homebridge
Where are your startup scripts located?
- Check /etc/systemd/system directory:
pi@raspberrypi:~ $ cd /etc/systemd/system
pi@raspberrypi:/etc/systemd/system $ ls -la
total 72
drwxr-xr-x 17 root root 4096 Mar 14 00:27 .
drwxr-xr-x 5 root root 4096 Mar 13 22:43 ..
-rw-r--r-- 1 root root 1551 Jul 4 2017 autologin@.service
drwxr-xr-x 2 root root 4096 Mar 13 23:05 bluetooth.target.wants
lrwxrwxrwx 1 root root 37 Mar 13 23:05 dbus-org.bluez.service -> /lib/systemd/system/bluetooth.service
lrwxrwxrwx 1 root root 40 Mar 13 23:07 dbus-org.freedesktop.Avahi.service -> /lib/systemd/system/avahi-daemon.service
lrwxrwxrwx 1 root root 34 Mar 13 23:08 dhcpcd5.service -> /lib/systemd/system/dhcpcd.service
drwxr-xr-x 2 root root 4096 Mar 13 23:19 dhcpcd.service.d
lrwxrwxrwx 1 root root 35 Mar 13 23:16 display-manager.service -> /lib/systemd/system/lightdm.service
drwxr-xr-x 2 root root 4096 Mar 13 23:41 getty.target.wants
drwxr-xr-x 2 root root 4096 Mar 13 22:55 getty@tty1.service.d
drwxr-xr-x 2 root root 4096 Mar 13 23:01 halt.target.wants
drwxr-xr-x 2 root root 4096 Mar 14 00:27 multi-user.target.wants
drwxr-xr-x 2 root root 4096 Mar 13 22:50 network-online.target.wants
drwxr-xr-x 2 root root 4096 Mar 14 00:27 pigpiod.service.d
drwxr-xr-x 2 root root 4096 Mar 13 23:01 poweroff.target.wants
drwxr-xr-x 2 root root 4096 Mar 13 23:07 rc-local.service.d
drwxr-xr-x 2 root root 4096 Mar 13 23:01 reboot.target.wants
drwxr-xr-x 2 root root 4096 Mar 13 23:06 remote-fs.target.wants
drwxr-xr-x 2 root root 4096 Mar 13 23:08 sockets.target.wants
drwxr-xr-x 2 root root 4096 Mar 13 23:04 sysinit.target.wants
lrwxrwxrwx 1 root root 35 Mar 13 22:49 syslog.service -> /lib/systemd/system/rsyslog.service
drwxr-xr-x 2 root root 4096 Mar 13 22:50 timers.target.wants
pi@raspberrypi:/etc/systemd/system $
- Check /etc/default directory:
pi@raspberrypi:/etc/systemd/system $ cd /etc/default
pi@raspberrypi:/etc/default $ ls -la
total 92
drwxr-xr-x 2 root root 4096 Mar 29 23:58 .
drwxr-xr-x 111 root root 4096 Mar 30 00:10 ..
-rw-r--r-- 1 root root 219 Jan 23 2017 avahi-daemon
-rw-r--r-- 1 root root 845 Oct 24 2016 bluetooth
-rw-r--r-- 1 root root 222 Oct 25 2016 bsdmainutils
-rw-r--r-- 1 root root 276 Mar 13 23:07 console-setup
-rw-r--r-- 1 root root 549 Aug 23 2014 crda
-rw-r--r-- 1 root root 955 Oct 7 15:38 cron
-rw-r--r-- 1 root root 297 Mar 2 09:59 dbus
-rw-r--r-- 1 root root 84 Mar 5 2012 fake-hwclock
-rw-r--r-- 1 root root 657 Mar 7 19:29 hwclock
-rw-r--r-- 1 root root 150 Mar 29 23:58 keyboard
-rw-r--r-- 1 root root 52 Mar 13 22:52 locale
-rw-r--r-- 1 root root 306 Jun 2 2015 networking
-rw-r--r-- 1 root root 793 Dec 15 2016 nfs-common
-rw-r--r-- 1 root root 1756 Jan 14 11:39 nss
-rw-r--r-- 1 root root 292 Mar 13 22:05 raspberrypi-kernel
-rw-r--r-- 1 root root 2062 Dec 10 13:57 rsync
-rw-r--r-- 1 root root 124 Jan 18 2017 rsyslog
-rw-r--r-- 1 root root 133 Mar 1 13:36 ssh
-rw-r--r-- 1 root root 625 Aug 3 2016 timidity
-rw-r--r-- 1 root root 548 Aug 30 2016 triggerhappy
-rw-r--r-- 1 root root 1118 Mar 13 23:07 useradd
pi@raspberrypi:/etc/default $
Conclusion: none of these directories contains “homebridge.service”…