/usr/share/kde4/services/ScreenSavers/ is in kscreensaver 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/services/ScreenSavers/KBanner.desktop
/usr/share/kde4/services/ScreenSavers/KBlob.desktop
/usr/share/kde4/services/ScreenSavers/KClock.desktop
/usr/share/kde4/services/ScreenSavers/KEuphoria.desktop
/usr/share/kde4/services/ScreenSavers/KFlux.desktop
/usr/share/kde4/services/ScreenSavers/KFountain.desktop
/usr/share/kde4/services/ScreenSavers/KGravity.desktop
/usr/share/kde4/services/ScreenSavers/KLines-saver.desktop
/usr/share/kde4/services/ScreenSavers/KLorenz.desktop
/usr/share/kde4/services/ScreenSavers/KPendulum.desktop
/usr/share/kde4/services/ScreenSavers/KPolygon.desktop
/usr/share/kde4/services/ScreenSavers/KRotation.desktop
/usr/share/kde4/services/ScreenSavers/KScience.desktop
/usr/share/kde4/services/ScreenSavers/KSlideshow.desktop
/usr/share/kde4/services/ScreenSavers/KSolarWinds.desktop
/usr/share/kde4/services/ScreenSavers/KSwarm.desktop
/usr/share/kde4/services/ScreenSavers/KVm.desktop
/usr/share/kde4/services/ScreenSavers/KWave.desktop
/usr/share/kde4/services/ScreenSavers/asciiquarium.desktop