I had forgotten that the testing in my previous message was with cups 2.3.3op2-3+deb11u1
where deleting all queues and restarting cups at least results in reliable queue creation for the autodetected printer. The situation is worse with 2.3.3op2-3+deb11u2. The queue for the auto-detected printer is only created if no other queue already exists. It still doesn't print. And even worse: $ sudo lpadmin -p testqhostname -v ipp://192.168.0.14/ipp/print -E -m driverless:ipp://192.168.0.14/ipp/print lpadmin: Printer drivers are deprecated and will stop working in a future version of CUPS. lpadmin: Unable to open PPD "/tmp/3986562c28d87": Missing PPD-Adobe-4.x header on line 0. No queue is created even after reboot, retry. I will update upstream with the details of both sets of problems. Thanks, Gareth
