[SOLVED] “Could not reliably determine the server’s fully qualified domain name, using … for ServerName”

You might probably faced the same following error while you were restarting the Apache server on Ubuntu.

$ sudo /etc/init.d/apache2 restart
* Restarting web server apache2                                                apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.1.1 for ServerName
… waiting apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.1.1 for ServerName

To fix that problem, you need to edit the httpd.conf file. Open the terminal and type,

$ sudo gedit /etc/apache2/httpd.conf

By default httpd.conf file will be blank. Now, simply add the following line to the file.
ServerName localhost

Save the file and exit from gEdit.

Finally restart the server.
$ sudo /etc/init.d/apache2 restart

References: http://russenreaktor.wordpress.com/2010/04/17/solved-“could-not-reliably-determine-the-server’s-fully-qualified-domain-name-using-for-servername”/