Your problem is with the line rm -rf /var/lib/apt/lists/* . You are deleting the lists that have been fetched by the apt-get update . You then try to install a package using apt. This will fail.
You need to move rm -rf /var/lib/apt/lists/ after the line that installs mysql-server.
# Download base image ubuntu 16.04 # Update Ubuntu Software repository # Install PHP, nginx, mySQL RUN apt-get install -y nginx php7.0-fpm # Install MySQL and set default root password RUN echo 'mysql-server mysql-server/root_password password mypassword' | debconf-set-selections RUN echo 'mysql-server mysql-server/root_password_again password mypassword' | debconf-set-selections RUN apt-get install -y mysql-server && rm -rf /var/lib/apt/lists/* # Define the ENV variable ENV nginx_vhost /etc/nginx/sites-available/default ENV php_conf /etc/php/7.0/fpm/php.ini ENV nginx_conf /etc/nginx/nginx.conf # Enable php-fpm on nginx virtualhost configuration COPY default ${nginx_vhost} RUN sed -i -e 's/;cgi.fix_pathinfo=1/cgi.fix_pathinfo=0/g' ${php_conf} && \ daemon off;" >> ${nginx_conf} RUN mkdir -p /run/php && \ chown -R www-data:www-data /var/www/html && \ chown -R www-data:www-data /run/php VOLUME ["/etc/nginx/sites-enabled", "/etc/nginx/certs", "/etc/nginx/conf.d", "/var/log/nginx", "/var/www/html"] # Configure Services and Port
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