Driverless printing with CUPS: client-error-bad-request / "Print job was not accepted."

I’ve just installed Debian Bookworm (12) on my workstation and can’t print via network on my Kyocera M2040dn anymore. It worked on Debian Bullseye (11) but I can’t recall if I needed to install the PPD back then. (I have a whole disk image backup of the old system but don’t how to extract this info from the old filesystem.) http://localhost:631/jobs/ shows Print job was not accepted. for any print job (The number of Pages seems to increase for every trial of printing) the log /var/log/cups/error_log completes jobs with client-error-bad-request I regularly use different IPP network printers in

Question by Daniel Böhmer on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.