ACPIPowerButton Issues

[heyraffaello]

When using systemd on the host to start/stop the guest (any guest OS--Ubuntu, CentOS, Win10, Win Server 2012) the guest aborts and does not shut down gracefully. From the command line, running the same command shuts the machine down gracefully. Host is Ubuntu 18.04.2 running VirtualBox 5.2.18.

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[Unit]
Description=Autostart For XXXX
Requires=vboxdrv.service
After=vboxweb-service.service vboxdrv.service

[Service]
Type=idle
User=virtualbox
Group=vboxusers

ExecStart=/usr/bin/VBoxHeadless --startvm "XXXX"
ExecStop=/usr/bin/VBoxManage controlvm "XXXX" acpipowerbutton

[Install]
WantedBy=multi-user.target

Then running:

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systemctl stop XXXX

Results in "Aborted" and clearly does not shut down gracefully.

However:

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$ VBoxManage controlvm "XXXX" acpipowerbutton

Results in a graceful shutdown and "Powered Off."

Thoughts and prayers appreciated.