Error
"/usr/lib/cups/backend/hp failed"
While printing test page on an HP printer
Solution
1- Create lpadmin group/add your user to that group
groupadd lpadmin
usermod -aG lpadmin
2- Delete printer from gnome printer settings ( application > Printing )
3- Unplug the printer
4- Restart cups
sudo service cups restart
5- Plug the printer back
It worked for me
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