title: Ubuntu RXTX does not recognize usb-serial device
body: <p>I'm connecting a device with librxtx-java to Ubuntu. The code previously worked in 10.04, but in 12.04 it can't discover the usb-serial connected to the computer.</p>
  
  <pre><code>java.util.Enumeration&lt;CommPortIdentifier&gt; portEnum = CommPortIdentifier.getPortIdentifiers();
  while ( portEnum.hasMoreElements() )
  {
      CommPortIdentifier portIdentifier = portEnum.nextElement();
      System.out.println( portIdentifier.getName() + " - " + getPortTypeName(portIdentifier.getPortType()) );
  }
  </code></pre>
  
  <p>This section of the code never goes into the while loop, despite the appropriate librxtx-java libraries being installed, and device being recognized (dmesg | tail shows USB "Serial Device converter detected" on one line).</p>
  
  <p><strong>Update:</strong></p>
  
  <p>It appears Ubuntu 12.04 64-bit isn't working with any usb-serial devices (although they show up in dmesg and show up as a /dev/ttyUSB, it seems to be more than just a problem with Java.</p>