Comment 42 for bug 1879206

I have similar problems. See: https://answers.launchpad.net/hplip/+question/692399

Running the latest version of Kubuntu and just tried to install brand new HP think tank 551 MFP.

Does involve similar warnings from print doctor saying it cannot access some files.

| PERMISSION |
--------------

USB Smart_Tank_Plus_550 Required - - OK Node:'/dev/bus/usb/003/002' Perm:' root lp rw- rw- rw- rw- r--'

Checking Permissions....

Checking for Configured Queues....
warning: Fail to read ppd=/etc/cups/ppd/Smart_Tank_Plus_550.ppd file
warning: Insufficient permission to access file /etc/cups/ppd/Smart_Tank_Plus_550.ppd
warning: Could not complete Queue(s) configuration check

Checking for HP Properitery Plugin's....
No plug-in printers are configured.

Diagnose completed... "

Is this entire issue due to a problem with folder permissions preventing an application or driver from accessing needed folders or files?

Please respond.

Kindest regards;
Scorch.