How to move VirtualBox VM from 1 machine to another

Environment: VirtualBox v4.1.8

1. Backup everything that you’ll be touching in case anything goes wrong and you need to revert back.
2. Move the <vm>.vdi hard disk file from the old machine’s "$HOME/.VirtualBox/VDI" to the new machine.
3. Move the <vm> directory from the old machine’s "$HOME/VirtualBox VMs" to the new machine.
4. Edit the "$HOME/VirtualBox VMs/<vm>/<vm>.vbox" file to change the old <HardDisk> location to that of the new machine.
5. Double-click on this vbox file to load it into VirtualBox.
6. Start the VM. It should load without any error.