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Asked: 2024-09-27T01:34:43+05:30 In:

What are the steps to remove OpenJDK from an Ubuntu system?

I’ve been trying to get my Ubuntu setup just right, and I think I might have overdone it with the Java installations. I installed OpenJDK a little while back to run some Java apps, but now I feel like it’s just taking up space and I’m not really using it anymore. I’ve heard that having multiple Java installations can create some conflicts and issues down the line, especially if I decide to switch to a different version or a different JDK altogether.

So, here’s the thing: I want to completely remove OpenJDK from my system. I’ve done some digging online, but there seem to be different methods and steps suggested all over the place, and I don’t want to mess things up. I mean, I can handle a few basic commands in the terminal, but when it comes to uninstalling things, I could really use a step-by-step guide from someone who may have gone through this already.

What I’d love to know is, what are the specific commands I should run? Should I just use `apt-get remove`, or is there a better way to make sure everything related to OpenJDK gets cleaned up? Also, if there are different versions of OpenJDK installed, do I need to specify which one I want to remove, or does the removal command take care of all of them at once?

Furthermore, after removing it, is there anything I should do to check if it’s really gone? Like, should I run a command or something to verify that Java is no longer on my system? I’d really appreciate it if someone could break down the steps for me in a way that’s easy to follow. There’s just so much info out there, and I could really use some clarity. Thanks in advance for your help!

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    2 Answers



    1. How to Uninstall OpenJDK on Ubuntu

      Uninstalling OpenJDK on Ubuntu

      If you want to remove OpenJDK from your Ubuntu system, you’ve come to the right place! Here’s a step-by-step guide that’ll help you do just that.

      Step 1: Open the Terminal

      You can do this by searching for “Terminal” in your applications or using the shortcut Ctrl + Alt + T.

      Step 2: Check Installed Versions of OpenJDK

      Before you uninstall, it’s good to know which versions of OpenJDK you have. Run this command:

      dpkg --list | grep openjdk

      This will show you a list of installed OpenJDK versions.

      Step 3: Uninstall OpenJDK

      If you want to remove a specific version, say openjdk-11-jdk, you can run:

      sudo apt-get remove openjdk-11-jdk

      If you want to remove all versions of OpenJDK at once, you can simply use:

      sudo apt-get remove openjdk*

      The asterisk (*) here means it’ll match any version of OpenJDK.

      Step 4: Clean Up Residual Files

      After uninstalling, it’s a good idea to remove any leftover configuration files as well. You can do this by running:

      sudo apt-get autoremove

      This command cleans up any dependencies that are no longer required.

      Step 5: Verify that OpenJDK is Gone

      To check if OpenJDK was successfully removed, you can run:

      java -version

      If Java is still installed, you will see its version. If you see a message saying that Java is not installed, then you’ve successfully removed OpenJDK!

      Step 6: Troubleshooting

      If for some reason you still see the Java version listed, it might be because you have a different Java installation (like Oracle JDK). In that case, follow similar steps to remove that version too.

      And that’s it! You should now have OpenJDK completely removed from your Ubuntu system. If you have any more questions or need further help, feel free to ask!




    2. Uninstalling OpenJDK on Ubuntu

      To completely remove OpenJDK from your Ubuntu system, you can use the apt-get command. First, you should identify which versions of OpenJDK are installed on your system. You can do this by running the command: dpkg --list | grep openjdk. This will give you a list of installed OpenJDK packages. Once you’ve identified the specific version you want to remove, you can execute the command: sudo apt-get remove openjdk--jdk, replacing with the appropriate version number (e.g., 11 or 17). If you want to ensure that all related packages are removed, you can opt for sudo apt-get purge openjdk--jdk, which not only removes the package but also deletes related configuration files.

      After executing the removal command, it’s good practice to run sudo apt-get autoremove to clean up any unused dependencies that were installed with OpenJDK. Finally, to verify that OpenJDK has been successfully removed, run java -version. If OpenJDK was removed correctly, you should see a message indicating that the command was not found or that Java is no longer installed. This process will help you maintain a clean system without leftover packages or configurations from OpenJDK.


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