[Mono-list] Problem with using opening serial port

[Mtx]

I'm developing a program in mono v1.9.1 which accesses the serial port & get
a strange I/O exception, this is my test code:

using System;
using System.IO.Ports;

namespace Rs232
{
	class MainClass
	{
		public static void Main(string[] args)
		{
			SerialPort mySerial;
			mySerial = new SerialPort("/dev/ttyUSB0");
			
			try {
				mySerial.Open();
			} catch (Exception e){
				Console.WriteLine(e);
			}			
		}
	}
}

If I compile & run this on my laptop it works perfectly, but when I run it
on my desktop i get the following error:

System.IO.IOException: I/O Error
  at System.IO.Ports.SerialPortStream.SetSignal (SerialSignal signal,
Boolean value) [0x00000] 
  at (wrapper remoting-invoke-with-check)
System.IO.Ports.SerialPortStream:SetSignal
(System.IO.Ports.SerialSignal,bool)
  at System.IO.Ports.SerialPortStream..ctor (System.String portName, Int32
baudRate, Int32 dataBits, Parity parity, StopBits stopBits, Boolean
dtrEnable, Boolean rtsEnable, Handshake handshake, Int32 readTimeout, Int32
writeTimeout, Int32 readBufferSize, Int32 writeBufferSize) [0x00000] 
  at (wrapper remoting-invoke-with-check)
System.IO.Ports.SerialPortStream:.ctor
(string,int,int,System.IO.Ports.Parity,System.IO.Ports.StopBits,bool,bool,System.IO.Ports.Handshake,int,int,int,int)
  at System.IO.Ports.SerialPort.Open () [0x00000] 
  at (wrapper remoting-invoke-with-check) System.IO.Ports.SerialPort:Open ()
  at Rs232.MainClass.Main (System.String[] args) [0x0000b] in
/home/mtx/workspace/Mono/RS232/Rs232/Main.cs:19 

No matter what port I use (ttyS0,ttyUSB0) I always get this same error...
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