/usr/share/applications/screensavers/cubicgrid.desktop is in xscreensaver-gl-extra 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=CubicGrid
Exec=/usr/lib/xscreensaver/cubicgrid -root
TryExec=/usr/lib/xscreensaver/cubicgrid
Comment=Draws the view of an observer located inside a rotating 3D lattice of colored points. Written by Vasek Potocek.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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