On my laptop computer, I print to an HP Deskjet printer on a network share, and by default, Ubuntu prints the pages in order. This causes them to be out of order on the print tray. To fix the issue, go to /etc/cups/ppd and edit the .ppd file for your printer and add the line

[code]DefaultOutputOrder: "reverse"[/code]

You will need root access to change the file, which can be obtained by opening a terminal and typing:

[bash]sudo nautilus[/bash]

or

[bash]sudo gedit[/bash]