Can you do the following tests
Power-cycle your printer. Print a job, trhe job could come out normally. Now run
sudo time /usr/lib/cups/backend/usb
If the command does nogt return immediately, wait, it can take around 20 sec.
Print another job. Does it come out?
Run
again.
Print a third job and run
again. Does the third job get printed?
Please post all screen output here and attach your error_log.
Can you do the following tests
Power-cycle your printer. Print a job, trhe job could come out normally. Now run
sudo time /usr/lib/ cups/backend/ usb
If the command does nogt return immediately, wait, it can take around 20 sec.
Print another job. Does it come out?
Run
sudo time /usr/lib/ cups/backend/ usb
again.
Print a third job and run
sudo time /usr/lib/ cups/backend/ usb
again. Does the third job get printed?
Please post all screen output here and attach your error_log.