Problema SOLVED !!
This problem is easy to indentify chaking log in
/var/log/roundcube/errors if it be show error:
[09-Nov-2012 18:28:32 -0200]: DB Error: _doConnect: [Error message: Access denied for user 'roundcube'@'localhost' (using password: YES)]So you can solve it change the privilegies in mysql on roundcube database setting the correct password to roundcube user found in /etc/roundcube/debian-db.php to use the mysql command below:
~# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 95
Server version: 5.5.28-0ubuntu0.12.04.2 (Ubuntu)
Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> GRANT SELECT ON roundcube.* TO roundcube@'localhost' IDENTIFIED BY '<$dbpass in /etc/roundcube/debian-db.php>';
Query OK, 0 rows affected (0.00 sec)
mysql> \q
~#DONE !!!
now you can test agin to access roundcube by Browser.
Best Regards
SPQR Team!