You can remove the packages in Ubuntu by executing the commands:
dpkg --purge phpmyadmin dpkg --purge mysql-server dpkg --purge apache2.2-common
Or
You have option also to remove the following packages:
sudo apt-get remove apache2* sudo apt-get remove phpmyadmin sudo apt-get remove mysql-server sudo apt-get remove php5
Or
sudo apt-get --purge apache2* sudo apt-get --purge phpmyadmin sudo apt-get --purge mysql-server sudo apt-get --purge php5