and post its answer here. Especially in the case of not getting any answer, check /var/log/syslog whether new lines containing "audit" or lines with error messages appear. Please post these lines here.
Try also
sudo /usr/lib/cups/backend/parallel
and do the same as above.
Now try following the instructions of the section "AppArmor Protection of the printing system" on https://wiki.ubuntu.com/DebuggingPrintingProblems and repeat the commands above. Do you get answers now? Are you able to print now?
Please run the following command
/usr/lib/ cups/backend/ parallel
and post its answer here. Especially in the case of not getting any answer, check /var/log/syslog whether new lines containing "audit" or lines with error messages appear. Please post these lines here.
Try also
sudo /usr/lib/ cups/backend/ parallel
and do the same as above.
Now try following the instructions of the section "AppArmor Protection of the printing system" on https:/ /wiki.ubuntu. com/DebuggingPr intingProblems and repeat the commands above. Do you get answers now? Are you able to print now?