I have a Samsung M2020W laser printer connected via USB port to my multiboot PC. Successfully installed Samsung Unified Linux printer driver (file: uld_v1.00.39_01.17.tar.gz).
In openSUSE Leap 15.0 KDE 64 bit, System Settings > hardware shows no printer. I had to add my userid to Root group before I can see the printer icon then add and configure the printer.
In Debian 9.5 KDE 64 bit, I did the following but am still not able to see the printer either in KDE connect or System Settings > Hardware > Input Devices:
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sudo adduser username root
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system-config-printer
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Add (m2020w printer)
Any suggestions? Thanks a lot for your help.