Reinstall Setting up lamp server on ubuntu 12

-remove LAMP

apache2 apache2-mpm-prefork apache2-utils apache2.2-common libapache2-mod-php5 libapr1 libaprutil1 libdbd-mysql-perl libdbi-perl libnet-daemon-perl libplrpc-perl libpq5 mysql-client-5.5 mysql-common mysql-server mysql-server-5.5 php5-common php5-mysql

-remove mySQL

mysql-client-core-5.5 mysql-server-core-5.5

apt-get remove mysql*

or

sudo apt-get purge apache2
sudo apt-get purge php5
sudo apt-get purge mysql-server
sudo apt-get clean
sudo apt-get autoremove
sudo apt-get install apache2 php5 mysql-server

start reinstall

sudo apt-get install apache2
Open a web browser and navigate to http://localhost/. You should see a message saying It works!
sudo apt-get install mysql-server
sudo /etc/init.d/apache2 restart
sudo apt-get install php5 libapache2-mod-php5
sudo /etc/init.d/apache2 restart
sudo gedit /var/www/testphp.php
<?php phpinfo(); ?>
sudo rm /var/www/testphp.php