I recently changed my Wubi install into a full install, which runs a lot smoother than Wubi. I had to re-install all my stuff, because I did it the lazy-man's way, and after reinstalling Java, I decided to use Oracle's build, as it's known to be more stable, and there's not a single Java program that breaks under Oracle's.
But, now I find that certain programs, namely 3D ones, are having some big glitches, and I know for a fact these glitches are caused by Java 7 being not-so-Java 6-ish, as the same programs work fine under my Windows boot, which has Java 6 on it.
There is some information that may make it seem like I want to run OpenJDK, or something, but that is not the case. I just want to know how to downgrade from Oracle Java 7, down to Oracle Java 6.
EDIT: To install, I used the following method:
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer