/etc/xdg/autostart/gnome-fallback-mount-helper.desktop is in gnome-settings-daemon 3.4.1-0ubuntu1.
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 | [Desktop Entry]
Name=Mount Helper
Comment=Automount and autorun plugged devices
Exec=/usr/lib/gnome-settings-daemon/gnome-fallback-mount-helper
Icon=drive-optical
Terminal=false
Type=Application
Categories=
NoDisplay=true
OnlyShowIn=GNOME;Unity;
X-GNOME-Autostart-Notify=true
AutostartCondition=GNOME3 unless-session gnome
X-Ubuntu-Gettext-Domain=gnome-settings-daemon
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