Abra um terminal e instale a API do Java 3D:
sudo apt-get install libjava3d-java
E instale o Java 7 (OpenJDK) com
sudo apt-get install openjdk-7-jdk
Ou o Oracle 8 Java com
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer