Thats works great
i will try to help others with this same problem:
Making "global address book" using MySQL
1) Download the global address book plugin (confirm the roundcube version before download) and copy it to /usr/share/apache2/roundcubemail/plugins/
2) Untar the file using the command: tar -zxvf JohnDoh-Roundcube-Plugin-Global-Address-Book-06f1434.tar.gz
3) Rename the directory using the command: mv JohnDoh-Roundcube-Plugin-Global-Address-Book-06f1434 globaladdressbook
4) Enable the plugin: vi /usr/share/apache2/roundcubemail/config/main.inc.php
Change: $rcmail_config['plugins'] = array("password","managesieve",);
To: $rcmail_config['plugins'] = array("password","managesieve","globaladdressbook",);
5) Rename the configuration file using: mv /usr/share/apache2/roundcubemail/plugins/globaladdressbook/config.inc.php.dist /usr/share/apache2/roundcubemail/plugins/globaladdressbook/config.inc.php
6) Configuring: vi /usr/share/apache2/roundcubemail/plugins/globaladdressbook/config.inc.php
Inserting administrators accounts on "global address book":
Change: $rcmail_config['globaladdressbook_admin'] = null;
To: $rcmail_config['globaladdressbook_admin'] = array('email01@mydomain.com', 'email02@mydomain.com', 'email03@mydomain.com');
This will make your global address book work very well
I hope it help someone