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4.3. Web Interface
CUPS can be configured and monitored using a web interface, which by default is available at http:// localhost:631/admin. The web interface can be used to perform all printer management tasks.
In order to perform administrative tasks via the web interface, you must either have the root account enabled on your server, or authenticate as a user in the lpadmin group. For security reasons, CUPS won't authenticate a user that doesn't have a password.
To add a user to the lpadmin group, run at the terminal prompt:
sudo usermod -aG lpadmin username
Further documentation is available in the Documentation/Help tab of the web interface.