/etc/xdg/autostart/print-applet.desktop is in system-config-printer-gnome 1.5.7+20160212-0ubuntu2.
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 | [Desktop Entry]
Name=Print Queue Applet
Comment=System tray icon for managing print jobs
Exec=system-config-printer-applet
Terminal=false
Type=Application
Icon=printer
NotShowIn=KDE;LXDE;Unity;GNOME;
StartupNotify=false
X-GNOME-Autostart-Delay=30
X-Ubuntu-Gettext-Domain=system-config-printer
NoDisplay=true
X-Desktop-File-Install-Version=0.22
Categories=System;Monitor;GTK;
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