You didn't mention that you have set up the printer using the printer
applet on the settings menu. I'm a Kubuntu user so your details may be
different but in any case the remote printer does need to be set up
locally. There is a driver for the Canon Pixma ix6500 listed. If the
printer was plugged in locally it might well be found and set up for
you, but it isn't plug and play when you do network printing.