[GLE]

I typed putty this and putty replies:

root@sg:~# apt-get install apache2
Reading package lists... Done
Building dependency tree
Reading state information... Done
apache2 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@sg:~#

I type putty:
/etc/init.d/apache2 restart
Putty replies:
root@sg:~# /etc/init.d/apache2 restart
Restarting web server: apache2apache2: Could not reliably determine the server's fully qualified domain name, using 46.22.208.31 for ServerName
... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 46.22.208.31 for ServerName
.
root@sg:~#

How to fix this problem i type putty: /etc/init.d/apache2 restart and how to fix:
Restarting web server: apache2apache2: Could not reliably determine the server's fully qualified domain name, using 46.22.208.31 for ServerName
... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 46.22.208.31 for ServerName