I get only a black screen with a cursor after i start KDE with "dbus-launch --exit-with-session startkde". I investigated a little in startkde, it looks like it is stucked at the line "kwrapper5 ksmserver $KDEWM $KSMSERVEROPTIONS".

KLauncher sends a message: "KLauncher could not be reached via D-Bus. Error when calling kdeinit_exec_wait: The name org.kde.klauncher5 was not provided by any .service files." It sends this message twice then kdeinit5 segfaults. How could I get it to start correctly ?