cups does not allow adding, deleting or changing printers

Cups tells changing a printer the user would have to authenticate with username and password, but never asks for username and password in tune cups denys access to printer configurations and no changes are possible using the web interface.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: cups 2.2.7-1ubuntu2.1
ProcVersionSignature: Ubuntu 4.15.0-37.40-generic 4.15.18
Uname: Linux 4.15.0-37-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Tue Oct 9 20:12:12 2018
InstallationDate: Installed on 2011-10-19 (2546 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
Lpstat:
 device for Kyocera_FS-1300D: socket://kymi.fritz.box:9100
 device for PDF: cups-pdf:/
 device for Roger-Router-Fax: roger-cups:/
MachineType: Acer TravelMate P643-M
Papersize: a4
PpdFiles:
 Kyocera_FS-1128MFP: Kyocera FS-1118MFP - CUPS+Gutenprint v5.2.8-pre1
 Roger-Router-Fax: roger fax printer, 1.0
 PDF: Generic CUPS-PDF Printer
 Kyocera_FS-1300D: Kyocera FS-1300D (KPDL)
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-37-generic root=/dev/mapper/vg-root ro elevator=deadline splash acpi=force reboot=bios ipv6.disable=1 vt.handoff=1
SourcePackage: cups
UpgradeStatus: Upgraded to bionic on 2018-10-02 (7 days ago)
dmi.bios.date: 10/21/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: V2.15
dmi.board.asset.tag: No Asset Tag
dmi.board.name: TravelMate P643-M
dmi.board.vendor: Acer
dmi.board.version: V2.15
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.15
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV2.15:bd10/21/2013:svnAcer:pnTravelMateP643-M:pvrV2.15:rvnAcer:rnTravelMateP643-M:rvrV2.15:cvnAcer:ct9:cvrV2.15:
dmi.product.family: TravelMate P643-M
dmi.product.name: TravelMate P643-M
dmi.product.version: V2.15
dmi.sys.vendor: Acer
mtime.conffile..etc.cups.cupsd.conf: 2018-10-09T20:06:41.547549