Install Jenkins server on Ubuntu

jekins_server.sh

#!/bin/sh
sudo apt-get update
sudo apt-get install openjdk-6-jre
sudo apt-get install openjdk-6-jdk
sudo wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -
sudo sh -c 'echo deb http://pkg.jenkins-ci.org/debian binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt-get update
sudo apt-get install jenkins
sudo apt-get install ant

#Install PHP related dependencies

sudo apt-get install phpunit
sudo apt-get install php5-xdebug
sudo apt-get install php-pear

sudo pear config-set auto_discover 1
sudo pear install pear.phpunit.de/PHP_CodeCoverage
sudo pear install phpunit/PHP_Timer

Do you know where the jenkins upstart job is located? It's certainly not /etc/init/jenkins.conf.

Use sudo service jenkins ...