code: def unregister(name, delete=False):
      '''
      Unregister a VM
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' vboxmanage.unregister my_vm_filename
      '''
      nodes = list_nodes_min()
      if name not in nodes:
          raise CommandExecutionError(
              'The specified VM ({0}) is not registered.'.format(name)
          )
  
      cmd = '{0} unregistervm {1}'.format(vboxcmd(), name)
      if delete is True:
          cmd += ' --delete'
      ret = salt.modules.cmdmod.run_all(cmd)
      if ret['retcode'] == 0:
          return True
      return ret['stderr'f unregister(name, delete=False):
      '''
      Unregister a VM
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' vboxmanage.unregister my_vm_filename
      '''
      nodes = list_nodes_min()
      if name not in nodes:
          raise CommandExecutionError(
              'The specified VM ({0}) is not registered.'.format(name)
          )
  
      cmd = '{0} unregistervm {1}'.format(vboxcmd(), name)
      if delete is True:
          cmd += ' --delete'
      ret = salt.modules.cmdmod.run_all(cmd)
      if ret['retcode'] == 0:
          return True
      return ret['stderr']
docs: Unregister a VM
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' vboxmanage.unregister my_vm_filename