Lagging problem on Canon iX6850 on Debian Stretch

, at whatever printing speed, the results always are perfect as far as texts and images. Test pages generated by CUPS seem faultless Thanks in advance for your help Bernard

Bug#605589: hplip: - can not install printer

manager '/usr/lib/kde4/libexec/kdesu-uroot-csynaptic' appears to be running. Please quit the package manager and press enter to continue (i=ignore, r=retry*, f=force, q=quit) :q root@zeus:~# Regards (and sorry for the poor english ) Bernard -- To UNSUBSCRIBE, email to debian-printing-requ