Installing another ghostscript (gs) in RHEL breaks printing to Zebra (and other) printers

Solution In Progress - Updated -

Issue

  • I am trying to configure a Zebra ZT420 using cups and nothing prints.
  • Print jobs fail with the following message in the CUPS Error Log:

        D [19/Oct/2017:10:47:15 -0400] [Job 9675] Unknown device: cups
    

Environment

Red Hat Enterprise Linux (RHEL)
Common Unix Printing System (CUPS)

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