add $random_password on line pdo/wp_install.php before installing

before doing installation, modify wp_install.php inside the pdo folder so that it goes like this on line 54:

$message = __('<strong><em>Note that password: ' . $random_password . '</em></strong> carefully! It is a <em>random</em> password that was generated just for you.');

you have to add $random_password or you won’t get the password that’s automatically generated.