Can you make sure that you have killed all "hpssd" processes and then start
python /usr/share/hplip/hpssd.py -ldebug -x
After that start the hp-toolbox from another terminal window. Which error messages do you get in the first terminal window?
Can you make sure that you have killed all "hpssd" processes and then start
python /usr/share/ hplip/hpssd. py -ldebug -x
After that start the hp-toolbox from another terminal window. Which error messages do you get in the first terminal window?