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I would like to turn off my server by pressing the power button. The problem is if I am in the login screen (I haven't logged in yet). Pressing the power button will not shutdown my server. How can I solve this problem ?

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DO NOT DO WHAT @Sam IS SUGGESTING HERE. You will very likely corrupt your filesystem and lose data irrecoverably if you make a habit of this. – Jim Salter Nov 26 '12 at 1:34

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sudo apt-get update ; sudo apt-get install acpid

That should be all you need to do; after that, the server will catch the ACPI event caused by a short power button press and respond by shutting down cleanly.

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