This is desktop policy decision that a logged in user can shut down the
machine, this is expected behavior, and that's how / why clicking the
power button in top right corner -> shutdown icon works. Ditto long
clicking that shutdown icon works to suspend the machine too.
Being physical user on the physical display console, means one can pull
the power cord too, no need for sudo to do that.
If you don't want regular users to be able to shutdown the machine,
adjust the policy on your system accordingly.
** Changed in: systemd (Ubuntu)
Status: New => Opinion
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https://bugs.launchpad.net/bugs/1748095
Title:
Non-root user can reboot machine from the command line
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