Wuala does not start after a java version update (Linux/Kubuntu)
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Problem:
The file /home/<username>/wuala/wuala contains a static reference to the java binary (e.g. /home/usr/lib/jvm/java-6-sun-1.6.0.07/jre/bin/java). After upgrading the java version, the path will have changed to e.g. /home/usr/lib/jvm/java-6-sun-1.6.0.14/jre/bin/java which causes wuala to fail as the /home/<username>/wuala/wuala still points to the old location.

Solution:
/home/<username>/wuala/wuala should point to /home/usr/lib/jvm/java-6-sun/jre/bin/java instead of /home/usr/lib/jvm/java-6-sun-<version>/jre/bin/java as java-6-sun is a symlink that points to the proper directory and is automatically updated in case of a java update.

Note:
The bug affects (K)Ubuntu Linux distributions and might therefore not apply to other distributions or have to br fixed differently.