Failed to connect to bus: Connection refused

I am using Nas server, Netgear Readynas. This is my uname

root@nas316:~# uname -a
Linux nas316 4.4.190.x86_64.1 #1 SMP Mon Oct 28 01:55:46 UTC 2019 x86_64 GNU/Linux

Somehow can't restart server.

root@nas316:~# shutdown -r now
Failed to connect to bus: Connection refused
Failed to open /dev/initctl: No such device or address
Failed to talk to init daemon.

Also systemctl returns same error.

root@nas316:~# systemctl status apache
Failed to connect to bus: Connection refused

I googled around and try

root@nas316:~# dbus-launch
-bash: dbus-launch: command not found
root@nas316:~# echo $DBUS_SESSION_BUS_ADDRESS
(nothing appears)

I guess dbus-daemon is working though...

root@nas316:~# ps aux | grep dbus-daemon
root 8666 0.0 0.0 17836 1004 pts/0 S+ 12:30 0:00 grep dbus-daemon
root 30967 0.0 0.0 40436 404 ? Ss Jun13 0:00 /usr/bin/dbus-daemon --session --address=unix:path=/var/netatalk/spotlight.ipc --nofork --nopidfile --systemd-activation

Is there anything I can do ??

root@nas316:/etc# cat debian_version
8.11
root@nas316:~#ps 1 PID TTY STAT TIME COMMAND 1 ? Ss 4:31 /sbin/init
root@nas316:/run/systemd# ls -la /run/systemd/
total 0
drwxr-xr-x 15 root root 380 Jun 19 14:40 .
drwxrwxr-x 25 root admin 840 Aug 17 12:58 ..
drwxr-xr-x 2 root root 40 Feb 3 2021 ask-password
srwx------ 1 root root 0 Feb 3 2021 cgroups-agent
drwxr-xr-x 16 root root 400 Jun 19 14:40 generator
drwxr-xr-x 4 root root 220 Jun 19 14:40 generator.late
d--------- 2 root root 40 Feb 3 2021 inaccessible
drwxr-xr-x 2 root root 60 Feb 3 2021 initctl
drwxr-xr-x 3 root root 160 Feb 3 2021 journal
drwxr-xr-x 2 root root 40 Feb 3 2021 machines
srwxrwxrwx 1 root root 0 Feb 3 2021 notify
srwxrwxrwx 1 root root 0 Feb 3 2021 private
drwxr-xr-x 2 root root 60 Jun 13 06:11 seats
drwxr-xr-x 2 root root 40 Feb 3 2021 sessions
-rw-r--r-- 1 root root 0 Feb 3 2021 show-status
drwxr-xr-x 2 root root 40 Feb 3 2021 shutdown
drwxr-xr-x 2 root root 40 Feb 3 2021 system
drwxr-xr-x 2 root root 40 Feb 3 2021 transient
drwxr-xr-x 2 root root 40 Feb 3 2021 users

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