The problem looks like to be that printers re-renerate/update certificates frequently even if they haven't expired. CUPS notices that the certificate has changed and refuses to print. This happens with ipps protocol, which is default. Here are instructions to use ipp protocol, which does not check certificates.
https://github.com/OpenPrinting/cups/issues/1072 ** Bug watch added: github.com/OpenPrinting/cups/issues #1072 https://github.com/OpenPrinting/cups/issues/1072 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1973441 Title: Printing does not work on Ubuntu 22.04 - cups-pki-invalid Status in cups package in Ubuntu: Confirmed Bug description: After upgrading to 22.04 printing did not work. There is cups-pki- invalid error and printer goes to paused state. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: cups 2.4.1op1-1ubuntu4 Uname: Linux 5.17.7-051707-generic x86_64 ApportVersion: 2.20.11-0ubuntu82 Architecture: amd64 CasperMD5CheckResult: pass CupsErrorLog: Error: [Errno 13] Permission denied: '/var/log/cups/error_log' CurrentDesktop: ubuntu:GNOME Date: Sun May 15 15:34:47 2022 EcryptfsInUse: Yes InstallationDate: Installed on 2021-10-12 (214 days ago) InstallationMedia: Ubuntu 21.10 "Impish Indri" - Daily amd64 (20211010) Lpstat: device for HP_Color_LaserJet_M552_5F80BF: implicitclass://HP_Color_LaserJet_M552_5F80BF/ MachineType: ASUSTeK COMPUTER INC. ROG Strix G513QY_G513QY Papersize: a4 PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/HP_Color_LaserJet_M552_5F80BF.ppd'] failed with exit code 2: grep: /etc/cups/ppd/HP_Color_LaserJet_M552_5F80BF.ppd: Permission denied ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.17.7-051707-generic root=UUID=ff964c9b-ce92-4334-8759-9d785a262c60 ro rootflags=subvol=@ quiet splash vt.handoff=7 SourcePackage: cups UpgradeStatus: Upgraded to jammy on 2022-04-24 (21 days ago) dmi.bios.date: 03/29/2022 dmi.bios.release: 5.19 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: G513QY.318 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: G513QY dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.ec.firmware.release: 0.81 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrG513QY.318:bd03/29/2022:br5.19:efr0.81:svnASUSTeKCOMPUTERINC.:pnROGStrixG513QY_G513QY:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnG513QY:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku: dmi.product.family: ROG Strix dmi.product.name: ROG Strix G513QY_G513QY dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1973441/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
