Follow this steps.
sudo apt-get install apache2
sudo mkdir -p /var/www/example.com/public_html
sudo chown -R $USER:$USER /var/www/example.com/public_html
sudo chmod -R 755 /var/www
sudo nano /var/www/example.com/public_html/index.html
<html> <head> <title>www.example.com</title> </head> <body> <h1>Success: You Have Set Up a Virtual Host</h1> </body> </html>sudo cp /etc/apache2/sites-available/default /etc/apache2/sites-available/example.comsudo nano /etc/apache2/sites-available/example.com<VirtualHost *:80>ServerAdmin webmaster@example.com ServerName example.com ServerAlias www.example.com [...]DocumentRoot /var/www/example.com/public_htmlsudo a2ensite example.comsudo service apache2 restartFull Article
https://www.digitalocean.com/community/articles/how-to-set-up-apache-virtual-hosts-on-ubuntu-12-04-lts
