/usr/share/applications/screensavers/ is in rss-glx 0.9.1-6ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/applications/screensavers/biof.desktop
/usr/share/applications/screensavers/busyspheres.desktop
/usr/share/applications/screensavers/colorfire.desktop
/usr/share/applications/screensavers/cyclone.desktop
/usr/share/applications/screensavers/drempels.desktop
/usr/share/applications/screensavers/euphoria.desktop
/usr/share/applications/screensavers/feedback.desktop
/usr/share/applications/screensavers/fieldlines.desktop
/usr/share/applications/screensavers/flocks.desktop
/usr/share/applications/screensavers/flux.desktop
/usr/share/applications/screensavers/helios.desktop
/usr/share/applications/screensavers/hufo_smoke.desktop
/usr/share/applications/screensavers/hufo_tunnel.desktop
/usr/share/applications/screensavers/hyperspace.desktop
/usr/share/applications/screensavers/lattice.desktop
/usr/share/applications/screensavers/lorenz.desktop
/usr/share/applications/screensavers/matrixview.desktop
/usr/share/applications/screensavers/pixelcity.desktop
/usr/share/applications/screensavers/plasma.desktop
/usr/share/applications/screensavers/skyrocket.desktop
/usr/share/applications/screensavers/solarwinds.desktop
/usr/share/applications/screensavers/spirographx.desktop
/usr/share/applications/screensavers/sundancer2.desktop