Error Apache “apache2: Could not determine the server’s fully qualified domain name, using 127.0.0.1 for ServerName”

Error Apache “apache2: Could not determine the server’s fully qualified domain name,  using 127.0.0.1 for ServerName”

1. sudo vi /etc/apache2/conf.d/fqdn
2. Add “ServerName localhost”

Or Single Command

 echo “ServerName localhost” | sudo tee /etc/apache2/conf.d/fqdn