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A VirtualBox guest computer runs in a window. When you click [X] or click the Machine menu there is the option “ACPI Shutdown”.
Ubuntu Guests
To enable this on Ubuntu guests
$ sudo apt-get install acpid
from https://community.bitnami.com/t/mac-host-controlled-shutdown-of-vbox-rubystack-3-2-1/2904
Windows Guests
To enable this on Windows 10 guests
- Control Panel > Power Options > Choose what the power buttons do> When I press the Power Button = Shutdown
from https://blogs.oracle.com/fatbloke/entry/acpi_shutdown_and_windows_7
Dr James Bayley 