I installed the gnome-manual-duplex package from the AUR. In Ubuntu this used to add a virtual printer that you could print to.No printer was added when I installed this package on Arch linux. The application was installed and can be run standalone but it's mostly useful when used as a printer.How do I go about manually adding this printer to the list of available printers? It is not shown in the CUPS admin page.The official site says:Using the Gnome 3 Shell GUI:1)      $ gnome-session-properties        Startup Programs -> GnomeManualDuplex -> Enable        [logout][login]2)      Print -> GnomeManualDuplex (Virtual Printer) -> PrintBut there's no package called gnome-session-properties. There's one in AUR but it is outdated.
Gnome-manual-duplex in Gnome 3 on Arch linux
gnome3;printer
I solved the problem.The issue is that the /etc/xdg/autostart/gmd-applet-3.py.desktop runs a python2 script whereas the default python on Arch is python 3.I modified the EXEC line in the .desktop file from:Exec=/usr/share/gnome-manual-duplex/gmd-applet-3.py run-in-traytoExec=python2 /usr/share/gnome-manual-duplex/gmd-applet-3.py run-in-trayand it worked perfectly.