virtualbox.org

Hello, I have a pretty special question about a problem I experienced lately.

When I try to install newer Versions of Ubuntu, like 12.04, the installation gets stuck and even the live cd is not able to boot. The kernel tells Then the boot process stops and CPU load is high. Sending Ctrl+Alt+Del still works and triggers a restart of the virtual machine. I assume it could be a problem caused by a hardware conflict of the host system, which involves the Microsoft ACPI-Compliant Embedded Controller. Turning off IO-APIC in the settings of the virtual machine solves the problem. But IO-APIC is needed in the guest, to be able to use multiple cores.

Do you have any suggestions how this problem could be solved?

I am using the latest VirtualBox version 4.3.14 and Windows 7 Pro x64.

Does it work with version 4.3.12?

Also post the guests log file ( as an attachment )

The problem is solved!

I deactivated IO-APIC in the virtual machine settings and reduced the number of cores to 1. Then I was able to start the live CD and installed Ubuntu. After the installation and updating I activated IO-APIC and set the number of cores to 4 again. Now everything works fine, without guest additions.

The problem also occured when 4.3.12 was used, but starting the live CD with and without IO-APIC activated failed in this version.