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After upgrade from 10.10 -> 11.04 -> 11.10 -> 12.04 I got this error:

How can I solve this?

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Line kvm_intel: unknown parameter 'nested' says it all. You are attempting to do nested virtualization, i.e. run a virtual machine within another virtual machine (aka hypervisor), on a physical machine with an Intel processor. KVM supports this experimentally, but your kernel needs to have KVM with that support enabled. It looks like yours does not. Please see this tutorial for details on how to enable it.

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That tutorial explains how to add the 'nested' option, but that isn't the problem. He already has the 'nested' option enable to get the error message "kvm_intel: unknown parameter 'nested'". He actually needs to remove it because it is no longer a parameter for the kvm_intel module. – curtlee2002 Jul 23 '13 at 15:56

When you upgraded it didn't remove this file /etc/modprobe.d/qemu-system-x86.conf. The file contains option kvm-intel nested=1, but the nested option is no longer available. This causes loading the module to fail. Simply remove /etc/modprobe.d/qemu-system-x86.conf.

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