samco@samco-desktop:~$ cd arduhal
samco@samco-desktop:~/arduhal$ halrun arduino-vcp.hal
Waiting for component 'arduino' to become ready.................................................................................Traceback (most recent call last):
  File "/bin/arduino", line 46, in <module>
    ser = serial.Serial(PORT, 9600, timeout=2)
  File "/usr/lib/python2.6/dist-packages/serial/serialutil.py", line 166, in __init__
    self.open()
  File "/usr/lib/python2.6/dist-packages/serial/serialposix.py", line 175, in open
    raise SerialException("could not open port %s: %s" % (self._port, msg))
serial.serialutil.SerialException: could not open port /dev/ttyACM0: [Errno 5] Input/output error: '/dev/ttyACM0'

arduino-vcp.hal:1: arduino exited without becoming ready
samco@samco-desktop:~/arduhal$