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I want the PC to shut down without any dialogue, but let time for the applications to close properly.

One solution is, to change to: shutdown -h now but that does not wait for all applications to close.

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marked as duplicate by Tim, Eric Carvalho, Charles Green, muru, bcbc Dec 4 '14 at 2:45

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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

will change your the behaviour of the power button of your system from interactive (default) to immediate normal shutdown.

The command is gsettings set org.gnome.settings-daemon.plugins.power button-power <option>

Available options are:

  • Blank: does nothing
  • Suspend: makes your system suspend
  • Shutdown: starts a normal issued shutdown procedure
  • Hibernate: hibernates your system
  • Nothing: does nothing
  • Log out: log your user out
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Thanks for this answer. Where is this documented? – Alex Coventry Apr 14 '15 at 0:27
I don't know where this is documented. Possibly it is not. You can see the set of valid values with the gsettings range command. In this case, gsettings range org.gnome.settings-daemon.plugins.power button-power. Right now, in Fedora 22, the valid values are 'blank', 'suspend', 'shutdown', 'hibernate', 'interactive', 'nothing', and 'logout'. This list includes "interactive" which isn't in Bruno's list, and they are all lower case, with no spaces in "logout". I'm confident this list is syntactically correct, and Bruno's is not. No offense to Bruno. – matty Jun 12 '15 at 2:45

To do it GUI:

Install dconf-tools:

sudo apt-get install dconf-tools

open dconf-editor from dash or just run dconf-editor & in terminal

Navigate to org.gnome.settings-daemon.plugins.power and set your default button-power action there:

enter image description here

replace suspend by shutdown.

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Confirmed that this worked for a fully updated Ubuntu 14.04 LTS. – JavaScriptDude Feb 15 at 2:55

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