However, I would like to clarify how to change the password as per Skurudo instruction for whom may have similar problem because it took me few hours to try and finally understood a his tip coz my knowledge with Linux is very limited.
1. Open /var/lib/roundcube/config/db.inc.php or (db.inc.php.dpkg-bak)
and look for the password in the command
$rcmail_config[‘db_dsnw’] = ‘mysql://roundcube:password@localhost/roundcube’;
2. copy that password only
3. Open /etc/roundcube/debian-db.php
4. find $dbpass=’wrongpassword’;
5. Paste to replace ‘wrongpassword’ with the correct password.
That’s all! very simple.