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create separate sub page dedicated for JavaSE install
clarify steps are for Ubuntu via "apt"

Install Java SE 7 jdk (Oracle) via "apt"

Open a command line interface and enter the following (Ubuntu):

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

For other *nix variants you may have to add other repos or manually download and install Java.