A seguir a minha dica para os usuários que obteve o erro a seguir ao executar o VirtualBox no openSUSE 13.1:
“Qt CRITICAL: startkdeinitlock(20745): couldn’t create slave: “Cannot talk to klauncher: Not connected to D-Bus server”
klauncher(20956) kdemain: No DBUS session-bus found. Check if you have started the DBUS server.
kdeinit4: Communication error with launcher. Exiting!
Qt CRITICAL: startkdeinitlock(20745): Couldn’t start knotify from knotify4.desktop: “KLauncher could not be reached via D-Bus. Error when calling start_service_by_desktop_path:
Not connected to D-Bus server”
Solução, execute o comando precedito do parâmetro KDE_FORK_SLAVES :
KDE_FORK_SLAVES=1 virtualbox
Assunto NERD: 
Legal, to usando Freebsd e o comando funcionou redondo (no bash é claro).
Mas não entendi o que essa variável altera.