/usr/share/desktop-directories/Graphics.directory is in gnome-menus 3.10.1-0ubuntu2.
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 | [Desktop Entry]
Name=Graphics
Comment=Graphics applications
Icon=applications-graphics
Type=Directory
X-Ubuntu-Gettext-Domain=gnome-menus-3.0
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