HP LaserJet Professional P1102

I started with the obvious things:

• I checked that the power cable of the printer is plugged in.
• I checked that the usb cable is properly connected to the printer on one end and to the computer on the other.
• I opened the browser and checked the printer status via the cups web interface (http://localhost:631/printers/P1102). - Result: The printer status was stated as "/usr/lib/cups/backend/hp failed"
• A quick Google search brought me to the cups wiki page: https://wiki.archlinux.org/index.php/CUPS. On this page, there is a section on exactly the error message the cups web interface is giving me: https://wiki.archlinux.org/index.php/CU … Fhp_failed
• I tried the suggested solution (changing "SystemGroup sys root" to "SystemGroup lp root"). After that I stopped and started the cups daemon to make the change take effect. But that didn't help, printing still did not work and the error message stayed the same.
• Then I deleted the failed print jobs and restarted the printer device using the cups web interface. Unfortunately, the error again remained the same.

I have run out of ideas now. Maybe someone can gain some useful information from the following log file (/var/log/cups/error_log):

some more googling and desperately trying many different approaches to solve the problem finally led to the following change of device permissions:

cd /dev/bus/usb/002/
chmod a+rw *

After that, I was able to print again.