I have exactly the same situation (GDM running KDE over XDMCP on Ubuntu 6.06 with all updates applied, as of 21 March 2007) and GDM crashes every time a remote user logs out from KDE. This doesn't happen with Gnome or XFCE. I have to run sudo /etc/init.d/gdm restart to get it back again.
Afraid I can't add anything more useful than confirming this. -- gdm dies after logging out after using kde desktop (dapper) https://launchpad.net/bugs/78113 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
