Install postgres 9.2 and Postgis 2.0.x on Ubuntu

Setup.sh

#!/bin/bash

#Postgres Repository
sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" >> /etc/apt/sources.list.d/postgresql.list'
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -

apt-get install postgresql-9.2 postgresql-contrib-9.2

#Install POSTGIS
apt-get install postgresql-server-dev-9.2 libgeos-dev libproj-dev libgdal-dev -y -q
wget http://download.osgeo.org/postgis/source/postgis-2.0.3.tar.gz
tar xvzf postgis-2.0.3.tar.gz
cd postgis-2.0.3
./configure
make
make install
cd

#Guide to updating your data: http://www.postgis.org/docs/postgis_installation.html#upgrading