You don't have the right repositories.
Follow these directions
exactly as written.
Do
not deviate from them in any way.
Do not take smart shortcuts because you think you know what you're doing or add the given repositories to the ones you already have.
I repeat, follow these directions
exactly (don't worry--the first command backs up your current sources.list):
http://www.psychocats.net/linux/sources.php
Then
Code:
sudo apt-get update
sudo apt-get install d4x j2re1.4