My bad, Tested again with default kdmrc. And it works like expected and give me a unthemed KDM. No error message.
-- In dapper, kdm should depend on kubuntu-default-settings or have a different default theme https://launchpad.net/bugs/41720 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs