Install PHPMyAdmin after installing Mysql on Ubuntu 16.04

 sudo apt-get update
    sudo apt-get install phpmyadmin php-mbstring php-gettext

After opening PHPMyAdmin if you create a database and open it you may see

CONNECTION FOR CONTROLUSER AS DEFINED IN YOUR CONFIGURATION FAILED

You have to open this file

/etc/phpmyadmin/config-db.php

and see if the configuration is like this

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

save and close the file

restart mysql server by

sudo service mysql stop

sudo service mysql start