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Set Power Button to Shutdown

Install acpi sudo apt install acpid

sudo nano /etc/acpi/events/power
# add in
event=button/poweraction=/sbin/poweroff
# end
sudo systemctl restart acpid.service

Not working ones#

In dconf tool or in gsetting commandline:

gsettings set org.gnome.settings-daemon.plugins.power button-power 'shutdown'

or

In dconf tool or in gsetting commandline:

gsettings set org.gnome.settings-daemon.plugins.power power-button-action shutdown

Not working ones