Introduction
This guide is intended for Xubuntu and other users who cannot log into the CUPs web interface and would like to change their printer configuration with CUPs.
Setting Up CUPs Web Interface
First you need to add yourself to the lpadmin group. In terminal:
sudo usermod -aG lpadmin <username>
Last thing is to restart CUPs. This can be done by typing:
sudo /etc/init.d/cups restart
into the terminal.
To get to the CUPs web interface open up http://localhost:631/ in your web browser. When asked for a user name and password you can use you log-in user-name and password.
Why you can't log into CUPs web interface in Ubuntu
See http://www.cups.org/doc-1.1/sam.html#13_4
Printer Tweaking using LpOptions