It's not solved for me. I still get this message when trying to install a second printer. I have tried to reinstall hplip-gui but that didn't help.
Removing kdesudo doesn't seem like a good solution to me (and I haven't tried it) as it will break gdebi-kde and update-manager-kde.
The only way for me to install a second printer is to run sudo hp-setup from konsole.
It's not solved for me. I still get this message when trying to install a second printer. I have tried to reinstall hplip-gui but that didn't help.
Removing kdesudo doesn't seem like a good solution to me (and I haven't tried it) as it will break gdebi-kde and update-manager-kde.
The only way for me to install a second printer is to run sudo hp-setup from konsole.