/usr/share/applications/ is in xscreensaver-data 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/applications/screensavers/
/usr/share/applications/screensavers/fiberlamp.desktop
/usr/share/applications/screensavers/slidescreen.desktop
/usr/share/applications/screensavers/hexadrop.desktop
/usr/share/applications/screensavers/ripples.desktop
/usr/share/applications/screensavers/deco.desktop
/usr/share/applications/screensavers/binaryring.desktop
/usr/share/applications/screensavers/abstractile.desktop
/usr/share/applications/screensavers/m6502.desktop
/usr/share/applications/screensavers/shadebobs.desktop
/usr/share/applications/screensavers/xlyap.desktop
/usr/share/applications/screensavers/tessellimage.desktop
/usr/share/applications/screensavers/galaxy.desktop
/usr/share/applications/screensavers/fuzzyflakes.desktop
/usr/share/applications/screensavers/distort.desktop
/usr/share/applications/screensavers/metaballs.desktop
/usr/share/applications/screensavers/cwaves.desktop
/usr/share/applications/screensavers/penrose.desktop
/usr/share/applications/screensavers/swirl.desktop