In this tutorial, we will guide you on how to completely remove OpenJDK-9 and related files from your Ubuntu system. This process involves uninstalling the software, removing any remaining packages, and purging any related files. Let’s get started.
To completely remove OpenJDK-9 and related files in Ubuntu, you can use the apt-get command to uninstall the software, remove any remaining packages, and purge any related files.
Checking the Current Version of JDK
Before we start with the removal process, it’s essential to verify the installed version of JDK on your system. To do this, open a terminal and run the following command:
java -versionThis command will display the version of Java installed on your system. If you see an output similar to “openjdk version ‘9.x.x'”, it means you have OpenJDK-9 installed.
Removing OpenJDK-9
To remove OpenJDK-9, you will need to use the apt-get command, which is the package handling utility in Ubuntu. Run the following command:
sudo apt-get remove openjdk-9-*The sudo command is used to execute the command as a superuser. The apt-get remove command is used to remove a package, and openjdk-9-* specifies that all packages starting with ‘openjdk-9-‘ should be removed.
Removing Remaining OpenJDK-9 Packages
After removing OpenJDK-9, there might be some remaining packages that are no longer needed. To remove these packages, run the following command:
sudo apt-get autoremoveThe autoremove option is used to remove packages that were automatically installed to satisfy dependencies for other packages and are now no longer needed.
Purging Related Files
To ensure that all related files are removed, you need to purge them. Purging will remove any configuration and data files. To do this, run the following command:
sudo apt-get purge openjdk-9-*The purge option is used to remove a package and its configuration files.
Verifying the Removal
After purging, you can verify that OpenJDK-9 has been completely removed by checking the version of Java again:
java -versionIf you see an output similar to “Command ‘java’ not found”, it means you have successfully removed OpenJDK-9 from your system.
Conclusion
By following these steps, you should be able to completely remove OpenJDK-9 and related files from your Ubuntu system. This can be useful if you need to install a different version of JDK or if you are troubleshooting software issues. Always remember to verify the removal to ensure that the process was successful.
Yes, you can remove OpenJDK-9 without affecting other applications. However, if those applications specifically require OpenJDK-9, they may not function properly after its removal. It’s recommended to check the dependencies of other applications before removing OpenJDK-9.
To check the dependencies of an application in Ubuntu, you can use the apt-cache depends [package_name] command. Replace [package_name] with the name of the application you want to check. This command will display a list of packages that the application depends on.
No, removing OpenJDK-9 will not affect your system’s default Java version. Ubuntu uses the update-alternatives command to manage the default Java version. The removal of OpenJDK-9 will not change the default version set by this command.
To set a different default Java version in Ubuntu, you can use the update-alternatives command. Run sudo update-alternatives --config java to see a list of available Java versions on your system. Enter the number corresponding to the version you want to set as the default, and press Enter.
Yes, you can reinstall OpenJDK-9 after removing it. To do this, you can use the apt-get install openjdk-9-* command. However, it’s important to note that reinstalling OpenJDK-9 may not bring back any previously installed packages or configurations that were removed during the uninstallation process.
