The Canon IP Pixma 4300 will not print duplex from the Debian computer.

So although I could select duplex and the printer tried to print duplex it did not in fact work. The pages were printed upside down and right side up alternating as is needed but the paper feed did not grab the first sheet and draw it back into the printer. May be there is a clue in this description as to how to write a better driver. I guess I should write at least one driver to meet Linus Torval's jocular challenge of "real programmers write their own drivers" but I would counter that reality is a myth and anyone can be a real programmer and, in fact, the world is full of real programmers and very few unreal programmers. I am only playing with words here and must get beyond this aggression towards Linus Torvals caused by some negative experiences of Linux geeks in the past.