A word of caution.
Result of uname -a in my Ubuntu 10.04.3 LTS
Linux mail.domain.com 2.6.32-34-server #77-Ubuntu SMP Tue Sep 13 20:54:38 UTC 2011 x86_64 GNU/Linux
Note that it's a Linux Kernel with "server" included, it's means differences between Desktop and Server Editions, not just a GUI.
So, for a production system, use the server edition.
Take a look
http://www.serverwatch.com/tutorials...iderations.htm
Regards.