VirtualBox fails to start on Ubuntu 10.04

Everytime I try to start a Virtual Machine (VM ) using VirtualBox in Ubuntu (right now I'm using Ubuntu 10.04 - Lucid Lynx ) I get an error as follows:

Failed to start the virtual machine UbuntuServer_9.10_32b.
VirtualBox can't operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

With these details:



Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {6375231a-c17c-464b-92cb-ae9e128d71c3}


To solve this We have to disable KVM modules using the following commands:


sudo rmmod kvm_intel
sudo rmmod kvm


Now the VM starts without any problem.