network printer not discovered

[Lothar W Frommhold]

When upgrading from Kubuntu 14.04.4 to Kubuntu 16.04.1 the black-white
laser printer (Canon MF 4700 series) continues to work, but the color laser
printer (Dell 3110cn), which also worked well under 14.04, turned
unresponsive. After removing and subsequent attempts to reinstall it, I
discovered that while the color printer could be pinged, it was invisible
to the system settings program. In other words, the color printer can not
be installed as intended. What is wrong? Any help would be appreciated!
Lothar
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