apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for

his is just a friendly warning and not reallya problem (as in that something does not work).

If you insert a

ServerNamelocalhost

in either httpd.conf or apache2.conf in /etc/apache2 and
restart apache the notice will disappear.

If you have a nameinside /etc/hostname you can also use that name instead of localhost.

And it uses 127.0.1.1 if it is inside your /etc/hosts:

127.0.0.1localhost
127.0.1.1myhostname
Preferred method

Troubleshooting Apache
If you get this error:

apache2:Could not determine the server's fully qualified domain name,

using127.0.0.1 for ServerName
then use a text editor such as "sudonano" at the command line or "gksudo gedit" on the desktop tocreate a new file,

sudo nano/etc/apache2/conf.d/fqdn
or

gksu"gedit /etc/apache2/conf.d/fqdn"
then add

ServerNamelocalhost
to the file and save. This can all be done ina single command with the following:

echo "ServerName localhost" | sudotee /etc/apache2/conf.d/fqdn
But on Ubuntu 14.04:

echo "ServerName localhost" | sudotee /etc/apache2/conf-available/fqdn.conf
sudo a2enconf fqdn
Don't forget the ".conf" (withoutwill not work).