This is the group management app that we intent to use for our federation plans.
I want to run this on a Ubuntu VM. Since Lucid is just around the corner and the beta seems to work OK, I will try to get grouper to work on Lucid.
The old Ubuntu Hardy does not have tomcat6 either.
I would like to stick as much as possible to Ubuntu provided packages (no manual source compilation), yet also try to stick with the stuff that the I2 guys have experience with (Sun's Java and no OpenJDK).
The Sun apps used to be in multiverse in Hardy, but they seem to have moved to a more fenced-off repository called 'partner'. See /etc/apt/sources.list on how to enable that.
Installing these packages will also pull down all the depending packages that you need:
apt-get install sun-java6-jdk tomcat6 ant