CUPS dosen't run correctly. I can't display the web page http://mybook_ip_adr:631
The symbol '__guard' was resolved in adding this line to /et/profile and /root.bashrc
This message : "Unable to bind socket for address 0.0.0.0:631-Address already in use" is perhaps about a non valid certifcate. (http://mybookworld.wikidot.com/print-server).