Just to let you guys know that ubuntu 10.04 seems to work with the linux iPrint client following the guidelines for 9.x - mainly:

Install the iPrint client (v5)

You then need to edit this file:

/etc/cups/cupsd.conf

and comment out the line:

Listen /var/run/cups/cups.sock

I then rebooted and was able to install printers :O)

Hope other find these notes useful!

Cheerz
IanB