apache2 Could not reliably determine the servers fully qualified domain name using 127 0 1 1 for ServerName

How to fix Apache – "Could not reliably determine the server’s fully qualified domain name, using 127.0.1.1 for ServerName" Error on Ubuntu

The following error while restarting the Apache server on Ubuntu Oneiric.

$ sudo /etc/init.d/apache2 restart

* Restarting web server apache2 apache2: Could not reliably determine the servers fully qualified domain name, using 127.0.1.1 for ServerName
... waiting apache2: Could not reliably determine the servers fully qualified domain name, using 127.0.1.1 for ServerName
Solution: add ServerName directive to /etc/apache2/httpd.conf

$ sudo vi /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 vi (or gedit).
Finally restart the server.

$ sudo service apache2 restart

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