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Hello,
You would need to find out what web server you are using first. To do that, you could run this command:
sudo netstat -plant | grep 80
This would show you the service that is currently listening on port 80. I believe that it could be either Nginx or Apache.
If you are using Nginx, you could achieve what you are trying to do with Nginx server blocks. You can have a look at this article here on how to set that up:
If you are using Apache, then you could do the same with Apache Virtual Hosts. You can have a look at this article on how to set that up:
https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-ubuntu-16-04
Hope that this helps! Regards, Bobby