Hi Laurent, I recently encountered and addressed/worked around this problem. So I cn provide some additional information that will hopefully enable you to actually fix it.
> The UPS should only be shutdown only in case of power loss. Is it > happening to you at every reboot/shutdown? Yes. > Could you check if the /etc/killpower exits on your machine, if it's the > case could you try to delete it? /etc/killpower does not exist The behaviour documented by this bug occurs under systemd but not under sysvinit. Also, changing mode from "none" to "standalone" in nut.conf made this problem disappear for me. I hope that helps, James
