1sudo add-apt-repository ppa:ondrej/php 2sudo apt-get update 3sudo apt-get install mcrypt php7.1-mcrypt

Verify if mcypt is really installed 1php -m|grep -i mcrypt Counter-check from phpmyadmin. If it say installed there, issue is that php-cli can't see mcrypt as a module. Find the mcrypt definition and symlink similar to below: 1ln -s /etc/php5/mods-available/mcrypt.ini /etc/php5/cli/conf.d/20-mcrypt.ini See details in …