LAMP (Linux, Apache, MySQL and PHP) is an open source Web development platform that uses Linux as operating system, Apache as the Web server,MySQL as the relational database management system and PHP as the object-oriented scripting language.
We have already discussed howto install LAMP server using the base installation.If you want to install separately use this procedure.

Apache2 installation

Install apache2 using the following command

sudo apt-get install apache2

How to instal LAMP server in ubuntu 9.04 (Jaunty Jackalop)

The following is the Easy way to Install LAMP server
Same can be used for installing DNS Server, DHCP Server etc

$sudo tasksel

Now you will get a window

Select LAMP server and Go