> (question: where can I found the cups version I'm using)
"dpkg-query -W -f '${Version}\n' cups" or on http://localhost:631/.> (question: do cardreader, ethernet an IP printers have some "more standard" interface too, such as USB? In that case those printers could be inserted in the category of the main interface ) cardreader? Some printers have more than one interface, they might have problems with only some of them.
signature.asc
Description: This is a digitally signed message part.
