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I have an Ubuntu installation on a partition on my Mac and I would like to boot Ubuntu from within Mac OS X using VirtualBox. When I want to start the machine I only get

Error loading operating system

I followed more or less these instructions for the setup.

I have also tried a ton of different settings for the virtual machine (IDE vs SATA, IO-APIC, etc.), none of them bringing me closer. Here is a summary:

  • MacBook Pro 2009

  • Host: MAC OS X Mavericks on /des/disk0s2

  • Guest: Ubuntu 12.04 LTS 64-bit on /des/disk0s4

  • sudo chmod 777 /dev/disk0s4

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