db.inc.php was not found

Binary package hint: roundcube

1)
Description: Ubuntu 10.04.1 LTS
Release: 10.04

2)
roundcube 0.3.1-3
roundcube-core 0.3.1-3
roundcube-mysql 0.3.1-3

3)
Trying to open http://www.myserver.com/roundcube appears the error message below:
"CONFIGURATION ERROR

db.inc.php was not found.
Please read the INSTALL instructions!
"

4) The roundcube webmail page should appear instead.

Explanation:
The symbolic link "/var/lib/roundcube/config/db.inc.php" is a broken one to "/etc/roundcube/db.inc.php" that not exists.

Even copying "/etc/roundcube/debian-db.php" to "/etc/roundcube/db.inc.php" and reloading/restarting apache2 the problem remains.