I would like my Computer to just power off when I press the hardware Power Button. Instead I dialog with a countdown and Options (Cancel, Restart, Power Off) comes up. How to disable this dialog and power off immediately?

Or at least, how to set the countdown to much, much less then 60 seconds?

up vote 2 down vote accepted

Ubuntu 18.04

gsettings set org.gnome.SessionManager logout-prompt false

or you can also try

gsettings set com.canonical.indicator.session suppress-logout-restart-shutdown true

In Ubuntu 18.04 or any similar Linux variants with acpi (if not you can probably install), make a file called /etc/acpi/events/power with

sudo nano /etc/acpi/events/power

and put

event=button/power
action=/sbin/poweroff

inside the file, close it, then

sudo service acpid restart

This is probably the simplest solution that definitely works.

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