Cant play on Ubuntu

[Guest]

I uninstalled everyhing that had "java" in its name.
Installed java.
And tried to install the java plugin.
But firefox wont regonize it.
What do?

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EDIT: I went to the addons manager, saw java console, and cicked the "Install" button.
All it said was "Error downloading"

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Oh - wait- that was for Java 5. >.<