Ubuntu Server Install PHP 5.3

This is example works on Ubuntu Server 9.04 and PHP 5.3.2
First remove all instances of PHP and related packages

1. add to /etc/apt/sources.list:
deb http://php53.dotdeb.org stable all
deb-src http://php53.dotdeb.org stable all

2. update and upgrade:
#apt-get update && apt-get upgrade

3. install:
#apt-get install php5 libapache2-mod-php5 php5-cli php5-mysql

4. check PHP version:
#php -v

Restart Apache