Configuration file in phpmyadmin will require a blowfish_secret to be set. Ensure to check if the below line is has the needed value.
$cfg[‘blowfish_secret’] = ; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */
If the config.inc.php file is not there, then make a file from sample copy and add in the above config settings
$ cp config.sample.inc.php config.inc.php
* Also, ensure that the config.inc.php that you are editing is in the right phpmyadmin folder. For this, check apache2/nginx server phpmyadmin config settings. In Ubuntu, you can check etc/apache2/conf-available/phpmyadmin.conf to see which folders are referenced for phpmyadmin setup
