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Looks like 11.04 missing javaws.jar. Not sure if it is intentional.

/usr/share/java$ java -version
java version "1.6.0_22"
OpenJDK Runtime Environment (IcedTea6 1.10.1) (6b22-1.10.1-0ubuntu1)
OpenJDK Server VM (build 20.0-b11, mixed mode)
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You can try and install Sun (now Oracle) Java version. You can find in that repository ppa:ferramroberto/java. You can add these repositry using that command:

sudo apt-add-repository ppa:ferramroberto/java

And install:

sudo apt-get update ; sudo apt-get install sun-java6-jre

I don't remeber if it is necessery but maybe you have to use update-java-alternatives command to change the default Java engine.

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