But anyway, that was easy enough to fix and I've released a new version that does run on Ubuntu (verified under 8.10) and that ought to me more sane and portable generally. One thing I need to work out is where the MIB files tend to be found on different systems.
I've renamed it to Jangle. It's possible to think of this as
Java Assistant for Networked Graphs that's, Like, Easy
but I wouldn't want you to read too much into it. Really.
Download, and run
(The new name has more zip, is less generic, and less likely to conflict with other tools.)