CHIRP

Issue description:
Chirp does not work with Wouxun KG-UVD1P on Ubuntu 18.04. Following message is displayed:
Failed to communicate with radio: Radio not responding

Same radio works with Windows (Virtualbox) and original Wouxun software - I am able to read/write.

Same cable is used for Linux and Windows connections. It is not moved, as I plug in the USB device in Vbox menu.

Environment:

• Wouxun KG-UVD1P radio
• CHIRP daily-20190120 on Ubuntu 18.04
• PL2303 cable (067b:2303)

lsusb report:

Bus 001 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x067b Prolific Technology, Inc.
  idProduct          0x2303 PL2303 Serial Port
  bcdDevice            3.00
  iManufacturer           1 Prolific Technology Inc.
  iProduct                2 USB-Serial Controller
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x000a  1x 10 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
Device Status:     0x0000
  (Bus Powered)

Chirp output on the console:

ERROR: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/chirp/ui/clone.py", line 256, in run
    self.__radio.sync_in()
  File "/usr/lib/python2.7/dist-packages/chirp/drivers/wouxun.py", line 292, in sync_in
    self._mmap = self._download()
  File "/usr/lib/python2.7/dist-packages/chirp/drivers/wouxun.py", line 278, in _download
    raise errors.RadioError("Failed to communicate with radio: %s" % e)
RadioError: Failed to communicate with radio: Radio not responding

ERROR: ----------------
ERROR: Clone failed: Failed to communicate with radio: Radio not responding
ERROR: --- Exception Dialog: Failed to communicate with radio: Radio not responding ---
ERROR: None