Is the file /usr/lib/cups/backend/hp available on your system and executable? If not, run
sudo apt-get install --reinstall hplip
Otherwise, if you are not able to print again, follow the instructions of the section "CUPS error_log" on https://wiki.ubuntu.com/DebuggingPrintingProblems.
Is the file /usr/lib/ cups/backend/ hp available on your system and executable? If not, run
sudo apt-get install --reinstall hplip
Otherwise, if you are not able to print again, follow the instructions of the section "CUPS error_log" on https:/ /wiki.ubuntu. com/DebuggingPr intingProblems.