How install Java 6 JDK on Ubuntu 12.04

First, it's important to create the file for add ppa repositories, you can make a file called :

cmonterrosa@server:/tmp$touch add-apt-repository



#!/bin/bash
if [ $# -eq 1 ]
NM=`uname -a && date`
NAME=`echo $NM | md5sum | cut -f1 -d" "`
then
        ppa_name=`echo "$1" | cut -d":" -f2 -s`
        if [ -z "$ppa_name" ]
        then
                echo "PPA name not found"
                echo "Utility to add PPA repositories in your debian machine"
                echo "$0 ppa:user/ppa-name"
        else
                echo "$ppa_name"
                echo "deb http://ppa.launchpad.net/$ppa_name/ubuntu precise main" >> /etc/apt/sources.list
                apt-get update >> /dev/null 2> /tmp/${NAME}_apt_add_key.txt
                key=`cat /tmp/${NAME}_apt_add_key.txt | cut -d":" -f6 | cut -d" " -f3`
                apt-key adv --keyserver keyserver.ubuntu.com --recv-keys $key
                rm -rf /tmp/${NAME}_apt_add_key.txt
        fi
else
        echo "Utility to add PPA repositories in your debian machine"
        echo "$0 ppa:user/ppa-name"
fi



after, you should move this file

cmonterrosa@server:/tmp$ sudo cp add-apt-repository /usr/sbin/


Add the ppa repo

sudo add-apt-repository ppa:flexiondotorg/java


Update the list

sudo apt-get update

Install the packets:

 sudo apt-get install sun-java6-jdk sun-java6-plugin