/usr/share/applications/gnome-system-monitor.desktop is in gnome-system-monitor 3.8.2.1-2ubuntu1.
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 11 12 13 14 15 16 17 | [Desktop Entry]
Name=System Monitor
Comment=View current processes and monitor system state
TryExec=gnome-system-monitor
Exec=gnome-system-monitor
Icon=utilities-system-monitor
Terminal=false
Type=Application
StartupNotify=true
Categories=GNOME;GTK;System;Monitor;
NotShowIn=KDE;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=system-monitor
X-GNOME-Bugzilla-Component=general
X-GNOME-Bugzilla-Version=3.8.2.1
Keywords=Monitor;System;Process;CPU;Memory;Network;History;Usage;
X-Ubuntu-Gettext-Domain=gnome-system-monitor
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