Printing icon missing from "Show Applications"

I installed Ubuntu 18.04 last week and everything works beautifully except that the "printing" icon is missing from "Show Applications".
When I run "system-config-printer" from a terminal the "Printers - localhost" opens up and shows the network printer.
When I use Synaptic and search for "system-config-printer-common" it finds it and shows installed version 1.5.11-1ubuntu2.
When I run "system-config-printer" from a terminal the following displays before the app is opened:

root@Ubuntu-18:/home/arno# system-config-printer
Error creating proxy: The connection is closed (g-io-error-quark, 18)
Error creating proxy: The connection is closed (g-io-error-quark, 18)
Error creating proxy: The connection is closed (g-io-error-quark, 18)
Error creating proxy: The connection is closed (g-io-error-quark, 18)
Error creating proxy: The connection is closed (g-io-error-quark, 18)

(system-config-printer:6764): libnotify-WARNING **: 07:14:35.760: Failed to connect to proxy