There is a great tutorial on installing Apache, MySQL, PHP on www.digitalocean.com. Below I propose a fast-forward guide.

• 1. Open a terminal. Right click on your desktop, and click Open in terminal. If on Ubuntu server just go to the next step.
• 2. Type the following command and hit ENTER to download package information from all configured sources. You may skip this step if recently done it.

  $ sudo apt update

• 3. Type the following command and hit ENTER to install Apache.

  $ sudo apt install -y apache2

• 4. Type the following command and hit ENTER to grant firewall access for Apache server.

  $ sudo ufw allow in "Apache Full"

• 5. To check functionality of Apache server open a browser and type in address bar.

  http://your_ip

  If you don't know your IP type in terminal this command and hit ENTER (notice "-I" is a -"capital i"):

  $ hostname -I

  There you are: you have your own apache web server.