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I realized that this might be the dumbest question here, but being a total beginner as I am, I really couldn't figure it out after trying all kinds of instructions I could found on the web.

Specs: Ubuntu 13.04;

What I intended to do: check out the Algorithm Competition section, by clicking the second-to-left tab,located on the top-left of the page: http://community.topcoder.com/tc

What I got: a pop-up saying

Java not found! Java could not be automatically detected on your machine. This page will attempt to automatically install Java and Java Web Start. If the download and installation does not occur automatically, click the link below to go to the Sun website where you can download the latest version of Java.

What I did: I followed instructions on this Ubuntu Documentation page: https://help.ubuntu.com/community/Java and installed OpenJDK(Java Runtime Environment/Browser plugin/SDK) through Ubuntu Software Center. Then I rebooted the system, tried the page again. But I still got the java not found pop-up described above.

Question: What's missing the get this working? Thank you!

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You should download the last version of java"7" and fellow this steps:

  1. First of all extract the file : tar -xvf ~/Folder

  2. Create jvm directory on /usr/lib : sudo mkdir -p /usr/lib/jvm/jdk1.7.0

  3. Copy the file into home folder to jvm/jdk.. : sudo mv jdk1.7.0_09/* /usr/lib/jvm/jdk1.7.0/

  4. Create repository for the java : sudo add-apt-repository ppa:nilarimogard/webupd8

  5. Update all packages on your ubuntu : sudo apt-get update

  6. Get the java update : sudo apt-get install update-java

  7. Update java : sudo update-java

  8. Check the version : java -version

If it's checked and it show you the version your java is well installed!

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