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This simple tutorial will show you how to install the Java Runtime Environment (JRE) on Ubuntu Karmic Koala. Java is needed in most software on Linux or Windows system. Actually, Java is an object-oriented programming language developed by Sun Microsystems.

Currently Ubuntu has the following Java packages:

sun-java6-bin – Contains the binaries

sun-java6-demo – Contains demos and examples

sun-java6-doc – Contains the documentation

sun-java6-fonts – Contains the Lucida TrueType fonts from the JRE

sun-java6-jdk – Contains the metapackage for the JDK

sun-java6-jre – Contains the metapackage for the JRE

sun-java6-plugin – Contains the plug-in for Mozilla-based browsers

sun-java6-source – Contains source files for the JDK

Steps to install Java Runtime Environment on Ubuntu Karmic Koala:

First make sure you already checked the multiverse and universe repository under your software sources. Next type this command below to install JRE:

sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts

Wait until installation finished and you can test your JRE installation by typing the following command on terminal.

java -version

You should get similar output

java version “1.6.0?
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

Also you can test Java Plugin for Firefox:

open Firefox and type

about:plugins

in the address bar and check for java plugin

More details.

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