Could not reliably determine the server's fully qualified domain name?

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If you are getting the following error:

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

This is just a friendly warning and not really a problem  it simply means that your hosts file does not include a valid FQDN(fully qualified domain name), nor is localhost an FQDN.(as in that something does not work).
If you insert a

ServerName localhost 

in either httpd.conf or apache2.conf in /etc/apache2 and restart apache the notice will disappear.
If you have a name inside /etc/hostname you can also use that name instead of localhost.

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

127.0.0.1 localhost
127.0.1.1 myhostname

Preferred method

Troubleshooting Apache

If you get this error:

apache2: Could not determine the server's fully qualified domain name, 
using 127.0.0.1 for ServerName

then use a text editor such as "sudo nano" at the command line or "gksudo gedit" on the desktop to create a new file,

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

or

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

then add

ServerName localhost

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

 echo "ServerName localhost" | sudo tee /etc/apache2/conf.d/fqdn

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