/usr/share/applications/gnome-session-properties.desktop is in gnome-startup-applications 3.28.1-0ubuntu2.
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 7 8 9 10 11 12 13 14 15 | [Desktop Entry]
Name=Startup Applications
Comment=Choose what applications to start when you log in
Exec=gnome-session-properties
Icon=session-properties
Terminal=false
Type=Application
StartupNotify=true
Categories=GTK;GNOME;Settings;X-GNOME-PersonalSettings;
OnlyShowIn=GNOME;Unity;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=gnome-session
X-GNOME-Bugzilla-Component=gnome-session-properties
X-GNOME-Bugzilla-Version=
X-Ubuntu-Gettext-Domain=gnome-session-3.0
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