Are you trying to run that from the command line, or by clicking on it in

the GUI?

Tried both. Double clicking results in about 2 seconds of the mouse pointer turning into the ubuntu "busy" pointer, then nothing. Running from command line "java DopplerPSK.jar" results in the one line error.

Have you marked the .jar file as executable?

looks ok: -rwxrwxr-x 1 dean dean 120002 Sep 19 2015 DopplerPSK.jar

Is the JAVA runtime installed on that PC? ( javac -version )

java version "1.8.0_201"

Ok, having written all that, it dawned upon me that AC2CZ's FoxTelem runs perfectly and is also a .jar, so I inspected his "foxtelem" start script to see how he starts FoxTelem. His command line is "java -jar FoxTelem.jar" - I wasn't using the "-jar" part. DUH.

Just tried it with the following terminal command and it started!! "java -jar DopplerPSK.jar"

Just another case of "OE" -> operator error.

--Roy K3RLD