PhpMyAdmin not working after PHP 7 update in Ubuntu

How To Install and Secure phpMyAdmin on Ubuntu 14.04 : https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-phpmyadmin-on-ubuntu-14-04

The mbstring extension is missing. – Solution:

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

and then sudo service apache2 restart.

http://stackoverflow.com/questions/35931418/phpmyadmin-error-the-mbstring-extension-is-missing-please-check-your-php-co