This is the default welcome page used to test the correct operation of the Apache2 server after installation on Ubuntu systems.
If you can read this page, it means that the Apache HTTP server installed at this site is working properly.
The configuration layout for an Apache2 web server installation on Ubuntu systems is as follows:
/etc/apache2/
├── apache2.conf
├── ports.conf
├── mods-enabled/
├── conf-enabled/
└── sites-enabled/
Please replace this file (located at /var/www/html/index.html) before continuing to operate your HTTP server.