mbstring is missing for phpmyadmin in ubuntu 16.04

When I installed phpmyadmin in Ubuntu 16.04 LTS, it gives me an error mentioned below.

The mbstring extension is missing. Please check your PHP configuration

then I tried to install php-mbstring, it says mbstring is up to date, Can anyone help me to solve this?

Please type in terminal:

sudo apt-get install php-mbstring php7.0-mbstring php-gettext libapache2-mod-php7.0

Then, restart apache2:

sudo systemctl restart apache2

Still missing?

You need to explicitly enable the PHP mcrypt and mbstring extensions, which can do by typing:

sudo phpenmod mcrypt
sudo phpenmod mbstring

Then, restart apache2:

sudo systemctl restart apache2

Done.
This has been reported here: PHPMyAdmin requires mbstring

If you want to use php 5.6 instead of php 7

Install php 5.6 mbstring package:

sudo apt-get install php5.6-mbstring

Then add the following line to the bottom of your php.ini file:

extension=php5.6-mbstring.so

Restart apache:

sudo service apache2 restart

To find your php.ini file, create a file and insert the following line:

<?php phpinfo(); ?>

Then open with a browser to see where your php.ini file is located.