How to install 64 bit JDK on Ubuntu 12.04

Posted November 10, 2013 9.8k views
I'm running Ubuntu 12.04 x64 and a Minecraft server on it, the tutorial I followed tells me to download the JDK (Java runtime), for obvious reasons. But when I run "java -d64" it says "This Java instance does not support a 64-bit JVM. Please install the desired version." How do I install the desired version correctly?

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sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer