I'm assuming that the results you report here correspond to the unexpected UPS shutdown on a re-booting Ubuntu box.

On Sat, 27 Jun 2020, Yogesh Bhanu wrote:

Following  messages are logged by journalctl when powering off.
--snip--

Jun 25 11:26:32 fourpi01 systemd[1]: Stopping Network UPS Tools -
power device driver controller...
Jun 25 11:26:32 fourpi01 upsdrvctl[258149]: Network UPS Tools - UPS
driver controller 2.7.4
Jun 25 11:26:32 fourpi01 usbhid-ups[1472]: Signal 15: exiting
Jun 25 11:26:32 fourpi01 systemd[1]: Starting Show Plymouth Reboot Screen...
Jun 25 11:26:32 fourpi01 systemd[1]: nut-driver.service: Succeeded.
snapd user session agent.
Jun 25 11:26:32 fourpi01 systemd[1547]: Reached target Shutdown.
Jun 25 11:26:32 fourpi01 systemd[1]: Stopped Network UPS Tools - power
device driver controller.
Jun 25 11:26:32 fourpi01 systemd[1]: Started Show Plymouth Reboot Screen.
Jun 25 11:26:32 fourpi01 systemd[257521]: Reached target Shutdown.
-- Reboot --
--snip--

I do not see any delayed UPS shutdown messages. How do you call for a UPS shutdown?

# So the system does poweroff. RPi is using SSD
# After this the UPS resets ...

# Command used to perform reboot.
--snip--
shutdown -r now
reboot
--snip--

I do not see any command to stop nut-server. Did you stop NUT before rebooting as suggested?

This is aside from your unwanted UPS shutdown problem. I do not understand why you call "reboot" when you have already asked "shutdown" to reboot.

# Following services are started by systemd at boot:

--snip--
root@fourpi01:~# systemctl list-units  | grep nut
 nut-driver.service
      loaded active running   Network UPS Tools - power device driver
controller
 nut-server.service
      loaded active running   Network UPS Tools - power devices information 
server
--snip--

I would expect to see

  nut-driver.service   loaded active running   Network UPS Tools - power device 
driver controller
  nut-monitor.service  loaded active running   Network UPS Tools - power device 
monitor and shutdown controller
  nut-server.service   loaded active running   Network UPS Tools - power 
devices information server

What happened to upsmon?

Roger

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