If you’re working on Ubuntu and running Apache, you probably have seen this error when rebooting Apache. It says “could not reliably determine the server’s fully qualified domain name.” There’s a simple fix to this configuration issue.

You’ll need to edit the /etc/apache2/httpd.conf config file:

sudo nano /etc/apache2/httpd.conf

and add this entry:

ServerName localhost

Reboot Apache

sudo /etc/init.d/apache2 restart

The error is now gone.