Ошибка serial0 при сборке виртуальной машины Ubuntu на хосте esxi

Я использую packer построить виртуальную машину на хосте ESXI 6.

В какой-то момент процесс останавливается, и я вижу несколько повторений следующего сообщения:

2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Failed to enforce the noRxLoss option: an overrun occurred while the virtual UART was in loopback mode.
2018-09-13T12:48:53.747Z| vcpu-2| I120: serial0: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun
2018-09-13T12:48:53.768Z| vcpu-2| I120: serial1: Overrun

Вот мой builder раздел моего packer шаблон

"builders": [
   {
    "type": "vmware-iso",
    "format": "ova",
    "vmx_data": {
      "memsize": "8192",
      "numvcpus": "4",
      "ethernet0.networkName": "somelanName"
   },

А вот предыдущий раздел журналов, показывающий (по-видимому, по умолчанию) конфигурацию, связанную с serial0

2018-09-13T12:46:27.930Z| vmx| I120: DICT        serial0.autodetect = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT          serial0.filename = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT          serial0.filetype = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT     serial0.pipe.endpoint = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT           serial0.present = "FALSE"
2018-09-13T12:46:27.930Z| vmx| I120: DICT    serial0.startconnected = "FALSE"
2018-09-13T12:46:27.930Z| vmx| I120: DICT       serial0.trynorxloss = ""
2018-09-13T12:46:27.930Z| vmx| I120: DICT    serial0.yieldonmsrread = ""