Ubuntu: Remove "Could not reliably determine the server's fully qualified domain name" Message

For some reason, Ubuntu’s default Apache install is missing a directive in /etc/apache2/apache2.conf. This leads to the following message on every service apache2 restart: * Restarting web server apache2 apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.1.1 for ServerName … waiting apache2: Could not reliably determine the server’s fully qualified […]