Ok.. this is to install java:
$ sudo apt-get install sun-java6-jre
Next step will be to download wyvern, so go to a folder you would like it to download and:
$ wget
http://www.cabochon.com/downloads/je...ne/install.jar
next step is install (might require sudo in front):
$ java -jar install.jar
and the last thing would probably be to use the create launcher on your desktop and in the command bit, fill this in:
sh /wyvern/client/wyvernclient