mysqli_real_connect(): (HY000/1045): Access denied for user ‘phpmyadmin’@’localhost’ (using password: YES)

Have you recently changed your MySQL Server root password? If answer is YES, than this is the cause of the error / warning inside phpMyAdmin console. To fix the problem, simply edit your phpMyAdmin’s config-db.php file and setup the proper database password.

/etc/phpMyAdmin/config-db.php

$dbuser='phpmyadmin';
$dbpass=''; // set current password between quotes ' '
$basepath='';
$dbname='phpmyadmin';
$dbserver='';
$dbport='';
$dbtype='mysql';