Can you attach your file /etc/cups/cupsd.conf and also an error_log of a failed job (as described on https://wiki.ubuntu.com/DebuggingPrintingProblems, section "CUPS error_log".
Can you attach your file /etc/cups/ cupsd.conf and also an error_log of a failed job (as described on https:/ /wiki.ubuntu. com/DebuggingPr intingProblems, section "CUPS error_log".