There might be a difference in the installers.  I think the server version may 
not have X by default, so the install is text mode.

http://www.debianadmin.com/ubuntu-lamp-server-installation-with-screenshots.html

Jeremy

On Thursday 06 December 2007 12:06:51 am Mike Miller wrote:
> Ubuntu offers both a desktop installation CD and a server installation CD.
> The server version offers very quick and easy LAMP installation:
>
> http://www.ubuntu.com/products/WhatIsUbuntu/serveredition
>
> The desktop version offers X, Compiz, OpenOffice and a ton of other
> software programs:
>
> http://www.ubuntu.com/products/WhatIsUbuntu/desktopedition
>
> Suppose you are like me and you want it all.  What's the easiest way to do
> an installation?  Should I do a desktop installation and then pop in the
> server CD to install LAMP?
>
> Have any of you tried to install both?
>
> Mike
>
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