Installing Java 7 on Ubuntu

To install Java 7 on Ubuntu, you can follow these steps:

1. Update the package index:

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   sudo apt-get update
   

2. Install the Java 7 runtime:

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   sudo apt-get install openjdk-7-jre
   

3. Set the default Java version:

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   sudo update-alternatives --config java
   

   This command will show you a list of available Java versions and ask you to select the default version. Select the Java 7 runtime by typing the corresponding number and pressing Enter.

4. Verify the installation:

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   java -version
   

   This command should print the Java version, which should be Java 7.

I hope this helps. Let me know if you have any questions.