Can you also run the following commands in a terminal window:
lsmod | grep usblp sudo /usr/lib/cups/backend/usb sudo rmmod usblp sudo /usr/lib/cups/backend/usb sudo modprobe usblp
Please post all the output here.
Can you also run the following commands in a terminal window:
lsmod | grep usblp cups/backend/ usb cups/backend/ usb
sudo /usr/lib/
sudo rmmod usblp
sudo /usr/lib/
sudo modprobe usblp
Please post all the output here.