As far as I know, EPF out of the box will not work on Kubuntu. You may
have to do some work to get the richtext working, because Kubuntu supplies
the latest firefox with shared libs, and SWT requires firefox with static
libs. I guess that's the reason editors will not show, since richtext
can't come up.
Please try our supported OS. OR if you get working around the issue,
please share it here for the benefits of others.