Install Java Runtime Environment (JRE) in Ubuntu 9.10 (Karmic)

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Java is an object-oriented programming language developed by Sun Microsystems in the early 1990s. Java applications are compiled to bytecode, which at runtime is either interpreted or compiled to native machine code for execution.

The language itself derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. JavaScript, a scripting language, shares a similar name and has similar syntax, but is not directly related to Java.

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

Installing the Java Runtime Environment

First you need to check multiverse repository enabled or not after that open a terminal window. Since you are going to be installing the JRE and the web browser plug-in, you’ll be using the following command from a terminal

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

Once it downloads the packages and begins the installation, you’ll get a screen that contains the Sun Operating System Distributor License for Java and hit Enter to continue.


You’ll see a dialog that asks you if you agree with the DLJ license terms. Select Yes, and hit Enter; the JRE will finish installing.


Testing Java Runtime Environment

You’ll want to confirm that your system is configured properly for Sun’s JRE. This is a two-step process.

First, check that the JRE is properly installed by running the following command from a terminal.

java -version

You should get similar output


Testing Java Plugin for Firefox

open Firefox and typing about:plugins in the address bar and check for java plugin


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41 Responses

  1. hopskole says:

    Where I can download java sun 6 ?
    I used Ubuntu 9.10

  2. electroarticles says:

    that appeared to be very awesome, cheers for the great explanation 🙂

  3. Patrick says:


    You need to open a terminal (also called a Konsole :)) and type in or copy and paste the command the author has written above:

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

    This will automatically install java for you.

  4. Pumpkin says:

    E: Could not get lock /var/lib/dpkg/lock – open (11: Resource temporarily unavailable)
    E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

  5. adams says:

    where i can get java packages,,,,cos i work offline n want to install java to other computer….

  6. helphelphelp says:

    hey guys could s.o. help me, please?
    when i type in this
    sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts
    it wont do, the terminal just closes. what can i do?

  7. sekhar says:

    I would like to setup the java development environment , can somebody pls help me?

  8. Nathan says:

    Very good and clear explanation, thank you very much.

  9. fantazzma says:


    Thanks a million. I was able to install JRE and, consequently, Juniper Network Connect. Now I’m able to connect to my work’s via ssl vpn.


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