system-config-printer hangs if you try to change make/model of a existing printer

[Julio]

I was able to add a new printer to my system. But if try to change the Make and Model of an existing printer the system hangs "Searching for drivers". I was able do reproduce the same problem with as fresh install of the system.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: system-config-printer 1.5.12-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.11
Architecture: amd64
CasperMD5CheckResult: skip
CupsErrorLog:
 W [10/Nov/2020:20:46:13 -0300] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'Generic-CUPS-PDF-Printer-Gray..\' already exists
 W [10/Nov/2020:20:46:13 -0300] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'Generic-CUPS-PDF-Printer-RGB..\' already exists
CurrentDesktop: XFCE
Date: Tue Nov 10 20:48:20 2020
InstallationDate: Installed on 2020-11-10 (0 days ago)
InstallationMedia: Xubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
Lpstat: device for Generic-CUPS-PDF-Printer: cups-pdf:/
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Lsusb-t:
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/12p, 12M
     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/12p, 480M
MachineType: innotek GmbH VirtualBox
PackageArchitecture: all
Papersize: a4
PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/Generic-CUPS-PDF-Printer.ppd'] failed with exit code 2: grep: /etc/cups/ppd/Generic-CUPS-PDF-Printer.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-52-generic root=UUID=ae91a28f-a8ce-443d-8d9f-59533c4728ec ro quiet splash
SourcePackage: system-config-printer
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.family: Virtual Machine
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH

[Julio (juliocoliveira)]

This looks like a permission problem, because the error do not occur if I run
system-config-printer as root (sudo system-config-printer).