I tried to add the printer:
HP Color LaserJet CP4020 Series Printer
but CentOS 7 must not know what driver to use.
I was able to add a brother 7050 printer (with an HP compatible driver??)
Is there a way to get a driver for the hp cp4020?
I googled for centos and this hp printer and looked on the hp driver site, but didn't find any info.