code: def _start_ubridge(self):
          
  
          # Prevent us to start multiple ubridge
          if self._ubridge_hypervisor and self._ubridge_hypervisor.is_running():
              return
  
          if self.ubridge_path is None:
              raise NodeError("uBridge is not available, path doesn't exist, or you just installed GNS3 and need to restart your user session to refresh user permissions.")
  
          if not self._manager.has_privileged_access(self.ubridge_path):
              raise NodeError("uBridge requires root access or the capability to interact with network adapters")
  
          server_config = self._manager.config.get_section_config("Server")
          server_host = server_config.get("host")
          if not self.ubridge:
              self._ubridge_hypervisor = Hypervisor(self._project, self.ubridge_path, self.working_dir, server_host)
          log.info("Starting new uBridge hypervisor {}:{}".format(self._ubridge_hypervisor.host, self._ubridge_hypervisor.port))
          yield from self._ubridge_hypervisor.start()
          if self._ubridge_hypervisor:
              log.info("Hypervisor {}:{} has successfully started".format(self._ubridge_hypervisor.host, self._ubridge_hypervisor.port))
              yield from self._ubridge_hypervisor.connect()
docs: Starts uBridge (handles connections to and from this node).