how to replace this file (located at /var/www/html/index.html) in Apache2 installed through LAMP in ubuntu 18.04 whenever I tried to open any .html or .php file it shows this error "Not Found
The requested URL ..... was not found on this server.
Apache/2.4.29 (Ubuntu) Server at localhost Port 80"
and at localhost port 80 "Apache Ubuntu default page It works! " opened