Problems with COM port on Ubuntu.

Using Arduino Installation & Troubleshooting
#1

Everything was fine until arduino IDE suddenly closed my COM port and sent me a message about error when opening COM port.

    processing.app.SerialException: Error when opening serial port '/dev/ttyUSB0'.
	at processing.app.Serial.<init>(Serial.java:178)
	at processing.app.Serial.<init>(Serial.java:77)
	at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:77)
	at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:175)
	at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
	at processing.app.Sketch.upload(Sketch.java:1671)
	at processing.app.Sketch.exportApplet(Sketch.java:1627)
	at processing.app.Sketch.exportApplet(Sketch.java:1599)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2380)
	at java.lang.Thread.run(Thread.java:745)
    Caused by: gnu.io.UnsupportedCommOperationException: Invalid Parameter
	at gnu.io.RXTXPort.setSerialPortParams(RXTXPort.java:213)
	at processing.app.Serial.<init>(Serial.java:163)
	... 9 more
    processing.app.debug.RunnerException: Error when opening serial port '/dev/ttyUSB0'.
	at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:101)
	at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:175)
	at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
	at processing.app.Sketch.upload(Sketch.java:1671)
	at processing.app.Sketch.exportApplet(Sketch.java:1627)
	at processing.app.Sketch.exportApplet(Sketch.java:1599)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2380)
	at java.lang.Thread.run(Thread.java:745)

I reinstalled arduino IDE and tried again but it still didn’t open. Then I tried to replace controller and it also didn’t help. So I decided that there had been problem with arduino board. But today I suddenly have found out that on Windows it works fine. Unfortunatly I have no other virtual COM devices to check their work. What could be the problem?

#2

Hi, welcome to the forum.

Which linux version and which Arduino version and which Arduino board do you use ?

It might be a conflict with older versions and the Java RX TX library.

Please remove all Arduino packages from the repositories. They are old and outdated.
Remove the Java RX TX library. I think the package name is "librxtx-java".
I did install the "default-jre" and "java-common" and a number of Java packages that came along with those. But no more Java.

Download Arduino IDE 1.6.1 and unpack it in a folder. Run it from that folder.

It could still be some hardware problem... ::slight_smile:

#3
  1. Which version of the IDE are you using?
  2. open a terminal and type “groups” and paste the output on the forum
#4