workaround: delete line 143 (username section, containing text: greeter.lastLoggedInUser) /usr/share/kde4/apps/lightdm-kde-greeter/themes/classic/main.qml
workaround: lastLoggedInUse r) kde4/apps/ lightdm- kde-greeter/ themes/ classic/ main.qml
delete line 143 (username section, containing text: greeter.
/usr/share/