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Thanks a lot! Now I am able to execute the plug/unplug command, however, still some issues: When I tried to unplugcpu some CPU, VBox said that the CPU may still be used by the guest... as follows: MacBook-Pro:Ubuntu1204 yeung$ VBoxManage controlvm Ubuntu1204 unplugcpu 3 VBoxManage: error: Hot-Remove...

Hey all, I am using VirtualBox 4.1.18. My OS is MacOSX ver 10.7.4, processor is 2.7G Hz Intel Core i7, 4GB memory. I used the ubuntu-12.04-server-i386.iso to install an Ubuntu VM. After my installation, I would like to test the 'CPU Hotplug' function. Initially my VM has 1 CPU. When I try to enter: ...