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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