Comment 3 for bug 32302

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Pascal De Vuyst (pascal-devuyst) wrote : Re: duplicate printers listed when adding new printer

This is because 2 CUPS backends can be used for you HP USB printer: the "usb" CUPS-backend provided by cupsys and "hp" backend provided by hplip.

You can view the possible backends for your printer by running this command in a terminal/console:
$ lpinfo -v

Please select the "hp" CUPS backend because this allows you to view the printer ink levels and to do printer cartridge cleaning and alignment with the GUI program hp-toolbox, this is described here: https://wiki.ubuntu.com/HPPrinterInstallation.

According to me the best solution is:
If both a "usb" and "hp" backend are available for a printer gnome-cups-manager should only show the "hp" backend under "Use a detected printer" because of the above mentioned advantages of this backend. This would still allow you to select the "usb" backend under "Use another printer by specifying a port".

Another possible solution is to list both backends as is but to indicate that the "hp" backend is the recommended backend and put this at the top of the list of detected printers (now you need to select the second item in this list).

In both cases this behaviour needs to be changed in gnome-cups-manager.