I did another test and it seems that in CUPS 1.4.0-3 the USB backend still conflicts with AppArmor. Please run
sudo aa-complain cupsd
for the time being. Please report here whether USB printing works for you then, for us to know whether the other changes are working correctly.
I did another test and it seems that in CUPS 1.4.0-3 the USB backend still conflicts with AppArmor. Please run
sudo aa-complain cupsd
for the time being. Please report here whether USB printing works for you then, for us to know whether the other changes are working correctly.