Ubuntu can be shutdown from lock screen without password

[silver.bullet at zoho.com]

Oops :)

Begin forwarded message:

Date: Fri, 31 Jul 2015 14:09:08 +0200
From: silver.bullet at zoho.com
To: silver.bullet at zoho.com
Subject: Re: Ubuntu can be shutdown from lock screen without password


On Fri, 31 Jul 2015 13:58:44 +0200 I wrote:
> I still need to set up my Ubuntu install, so I don't know if this
> will work:
> 
> https://bbs.archlinux.org/viewtopic.php?pid=1546007#p1546007
> 
> It works for my Arch install.

PS:

This doesn't protect against a shutdown or reboot by ...

>>>>> If someone has access to your laptop, he can shut it down by
>>>>> pressing the power button or removing the battery anyway.

... resp. for my PC by disconnecting the mains plug or turning off the
power supply, but command line and applications require a password for
shutdown or reboot.