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I have several Ubuntu 10.10 (Maverick Meerkat) servers running in VirtualBox 4.0.4 (however this issue was also present in VirtualBox 3.2.8). When I issue an ACPI shutdown to the VMs, nothing happens.

I have added acpi=force to the top of /etc/default/grup (and ran sudo update-grub), and I have added agm_power_off=1 to /etc/modules.

I am at a lost for what to try next.

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Can you show us the log? did you try in your terminal as root VBoxManage controlvm 'virtualmachine' poweroff –  maniat1k Nov 6 '11 at 22:20

1 Answer 1

Ubuntu Server doesn't ship with ACPI support installed. See this thread for the original answer: link

To install ACPI support in Ubuntu, type this into a shell:

sudo apt-get install acpid
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