code: def _start_ubridge_capture(self, adapter_number, output_file):
          
  
          adapter = "bridge{}".format(adapter_number)
          if not self.ubridge:
              raise DockerError("Cannot start the packet capture: uBridge is not running")
          yield from self._ubridge_send('bridge start_capture {name} "{output_file}"'.format(name=adapter, output_file=output_file))
docs: Start a packet capture in uBridge.
  
          :param adapter_number: adapter number
          :param output_file: PCAP destination file for the capture