I'm still confused tho. My Brother printer/scanner is working now. I had added the legacy libnsl (not currently shipped with glibc) and created the unit files but the scanner didn't respond until I added "brother4" to /etc/sane.d/dll.conf. Thanks Hugh for the suggestions/advice and a wayback to David CB. Apparently there really is Better Living Through Dynamic Linking. I actually looked for my notes of the day, as this was a kind of a head scratcher for me. Still is. Although I stumbled through systemd while trying to target a moving target, systemd apparently wants a stationary one. I've disabled the unit files which I had added. Sane just works, also removing the error below. I'm not exactly sure what does the switching and hw endpoint stitching, but it is working. # systemctl --failed UNIT LOAD ACTIVE SUB DESCRIPTION ● saned.socket loaded failed failed saned incoming socket LOAD = Reflects whether the unit definition was properly loaded. ACTIVE = The high-level unit activation state, i.e. generalization of SUB. SUB = The low-level unit activation state, values depend on unit type. 1 loaded units listed. Pass --all to see loaded but inactive units, too. To show all installed unit files use 'systemctl list-unit-files'. Also thanks Hugh, Wayland fixed my stuttering display widget. I'd thought I was using Wayland by default, but it was actually running gdm.