20.04 automatically finds then incorrectly configures networked Canon MX920 Pixma printers

[Bill Wilken]

Strictly speaking, this is not a CUPS problem, but resides somewhere else in 20.04's internals that are designed to automatically find and configured printers.

One of my networked printers is a Canon MX920 Pixma unit. In an effort to be a "helpful Henry" 20.04 successfully finds this printer, but insists on configuring it as "driverless" which will not work. It can and must be configured in other ways. But once this is done, Ubuntu insists on repeatedly adding the printer as a driverless unit everytime the system boots.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: cups 2.3.1-9ubuntu1.1
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CupsErrorLog:

CurrentDesktop: ubuntu:GNOME
Date: Wed May 20 20:06:40 2020
InstallationDate: Installed on 2020-04-23 (27 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lpstat:
 device for Canon_MX920_series: cnijnet:/F8-0D-60-CB-BC-65
 device for [e-mail]: implicitclass://Canon_MX920_series%40000000CBBC65.local/
 device for MX920LAN: cnijnet:/F8-0D-60-CB-BC-65
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0bc2:ab24 Seagate RSS LLC Backup Plus Portable Drive
 Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Precision Tower 3620
Papersize: letter
PpdFiles:
 Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/MX920LAN.ppd', '/etc/cups/ppd/[e-mail]', '/etc/cups/ppd/Canon_MX920_series.ppd'] failed with exit code 2: grep: /etc/cups/ppd/MX920LAN.ppd: Permission denied
 grep: /etc/cups/ppd/[e-mail]: Permission denied
 grep: /etc/cups/ppd/Canon_MX920_series.ppd: Permission denied
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-31-generic root=UUID=e65bfed6-461a-497f-9aa7-a0a563a271f6 ro quiet splash vt.handoff=7
SourcePackage: cups
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/14/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.13.1
dmi.board.name: 0MWYPT
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.13.1:bd06/14/2019:svnDellInc.:pnPrecisionTower3620:pvr:rvnDellInc.:rn0MWYPT:rvrA01:cvnDellInc.:ct3:cvr:
dmi.product.family: Precision
dmi.product.name: Precision Tower 3620
dmi.product.sku: 06B7
dmi.sys.vendor: Dell Inc.