Ubuntu Eclipse

Add to list:

sudo add-apt-repository ppa:mercurial-ppa/releases

Update:

sudo apt-get update

Install:

sudo apt-get install mercurial

Ubuntu [x64] compatible with x86

Synaptic

      -> ia32

Download & install it!!

Ubuntu [x64] JRE/JDK Install

Add to list:
sudo add-apt-repository ppa:ferramroberto/java
Update:
sudo apt-get update
JRE:
sudo apt-get install sun-java6-jre sun-java6-plugin
JDK:
sudo apt-get install sun-java6-jdk
View version:
java -version