When running mule.sh on my Ubuntu 12.10 machine, I get:
mule.sh: 11: mule.sh: /bin/java: not foundThe closest reference I could find on the 'nets about something similar is from (a bug report for some other software) http://sourceforge.net/tracker/index.php?func=detail&aid=3535595&group_id=189407&atid=929202 which states:
The issue is actually due to JAVA_HOME not set.
The way to fix it is to set JAVA_HOME correctly. For example:
> JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/
> export JAVA_HOME
The developers can easily fix this issue if they replace the use of JAVA_HOME with simply callimg for "java" in the script. For example, instead of:
$JAVA_HOME/bin/java -Xmx128m -Dmetahome=$METAHOME -Djava.system.class.loader=nz.govt.natlib.meta.config.Loader
write:
java -Xmx128m -Dmetahome=$METAHOME -Djava.system.class.loader=nz.govt.natlib.meta.config.Loader
JAVA_HOME is not set up on every UNIX system. Yet if java is installed, calling directly for java will always work.
I hope this helps, because following the above commands does indeed work. I will hopefully love to play this old game because I played it as a kid on the 'ole Commodore 64C.

Cheers!