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/ or (
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.