/usr/share/kde4/services/ScreenSavers/ is in kscreensaver-xsavers 4:4.8.2-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/services/ScreenSavers/antspotlight.desktop
/usr/share/kde4/services/ScreenSavers/fiberlamp.desktop
/usr/share/kde4/services/ScreenSavers/fuzzyflakes.desktop
/usr/share/kde4/services/ScreenSavers/glblur.desktop
/usr/share/kde4/services/ScreenSavers/glcells.desktop
/usr/share/kde4/services/ScreenSavers/glmatrix.desktop
/usr/share/kde4/services/ScreenSavers/glschool.desktop
/usr/share/kde4/services/ScreenSavers/glslideshow.desktop
/usr/share/kde4/services/ScreenSavers/gltext.desktop
/usr/share/kde4/services/ScreenSavers/hypertorus.desktop
/usr/share/kde4/services/ScreenSavers/kpartsaver.desktop