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I have installed Ubuntu Precise (v. 12.04) on VirtualBox v. 4.1.12, on two different machines running Mac OS 10.5.8 and 10.6.8, respectively. All works as expected. I can shut down Ubuntu using the "Shut Down" command in the menu, and the guest OS does indeed shut down.
But when I try to shut down from the command line using sudo halt, while the guest OS does shut down, its window never disappears.
Does anyone have any idea why this might be? I have no such problem with Ubuntu Lucid (v. 10.04) in the same environments.
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VirtualBox is free and open source virtualization software from Oracle. It enables you to install other operating systems in virtual machines. It is recommended that your system should have at least 4GB of RAM to get decent performance from the virtual operating system.
If Ubuntu freezing in VirtualBox only happened occasionally, it could be a RAM issue. The host computer only has so much RAM. Even though VirtualBox allows you to run another operating system, it's still using your computer's resources.
It seems to be an open bug see: https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/880240 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/950129
Try sudo shutdown -h now instead.
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Try to disable 'I/O APIC' in VirtualBox-Configuration-Sytem-Motherboard menu.
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