I'm pretty new to hosting and this is my first time setting everything up. I used this guide to install LAMP on to Ubuntu https://www.vultr.com/docs/how-to-install-apache-mysql-and-php-on-ubuntu
and it seemed to work but I kept getting the message "Unable to resolve host vultr.guest" during the install. Then I tried to restart apache using "sudo service apache2 restart" and got the same message. What am I doing wrong?