Install Magento 2 PHP 7 extensions

sudo apt-get install php7.0

sudo apt-get install php7.0-gd php7.0-curl php7.0-mbstring php7.0-pdo php7.0-xml php7.0-intl php7.0-mcrypt php7.0-simplexml php7.0-soap php7.0-xsl php7.0-zip php7.0-json php7.0-iconv php7.0-mysql php7.0-fpm