Here are the steps to install Java:If you are running a 64-bit distribution on your development machine, you need to install additional packages first. For Ubuntu 13.10 (Saucy Salamander) and above, install the libncurses5:i386, libstdc++6:i386, and zlib1g:i386
packages using apt-get
:

sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libncurses5:i386 libstdc++6:i386 zlib1g:i386

For earlier versions of Ubuntu, install the ia32-libs
package using apt-get

apt-get install ia32-libs

Next, install Java:

apt-get install sun-java6-jdk