Comment 13 for bug 348109

Draco, open a terminal (Applications->Accessoires->Terminal), and enter this command:
gksudo gedit /usr/bin/azureus

After entering your password, an editor will open.
Near the beginning there should be a line that looks like this:
JAVA='/usr/lib/jvm/java-6-openjdk/jre/bin/java -Xmx1024M'

Replace everything after the JAVA=' and before the /java with the text /etc/alternatives
Taking the example of the line above (not sure whether yours is identical to that, I use a different installation), the line should now look like this:
JAVA='/etc/alternatives/java -Xmx1024M'

Make sure you don't delete the ' after the =
Save and exit, start Azureus.