Thank you for sending me back to HP. They now have a Zorin 16 package in 3.21.12 and they have fixed the problem with apparmor that prevented the scanner plug-in from working. It was a very painless printer installation, the first painless one in almost two years. I had installed 3.21.10 last week, and it was a bear!
I must say that with two days experience, I am very impressed wiith Zorin 16 Lite.