remove java ubuntu 20 04 with code examples

Removing Java from Ubuntu 20.04

Java is one of the most widely used programming languages and is used for developing a wide range of applications. If you are no longer using Java on your Ubuntu 20.04 system, you may want to remove it to free up some disk space. In this article, we will provide you with step-by-step instructions on how to remove Java from Ubuntu 20.04.

Before you proceed with the removal process, it is important to note that some applications or services may be using Java and may not work correctly after the removal. It is also important to backup your important data before proceeding with the removal process.

The following instructions provide the steps to remove Java from Ubuntu 20.04:

1. Remove OpenJDK

OpenJDK is the open-source version of Java and is usually installed by default on Ubuntu 20.04. To remove OpenJDK, use the following command in the terminal:

sudo apt-get remove openjdk-11-jre-headless

2. Remove Oracle Java

If you have installed Oracle Java on your system, use the following command to remove it:

sudo apt-get remove oracle-java11-installer

3. Remove Java Configuration Files

After removing the Java packages, you can remove the Java configuration files by using the following command:

sudo apt-get autoremove

4. Verify Java Removal

To verify the removal of Java, use the following command:

java -version

If Java has been successfully removed, the above command will display an error message indicating that Java is not installed.

In conclusion, removing Java from Ubuntu 20.04 is a straightforward process. By following the steps outlined in this article, you can remove Java from your system and free up some disk space. If you are unsure about the impact of removing Java, it is recommended to consult with a knowledgeable person or to seek assistance from the Ubuntu community forums.
Installing Java on Ubuntu 20.04

If you need to install Java on your Ubuntu 20.04 system, you can install either the open-source version (OpenJDK) or the proprietary version (Oracle Java). In this section, we will discuss how to install both versions.

1. Installing OpenJDK

OpenJDK is the open-source version of Java and is usually installed by default on Ubuntu 20.04. However, if you need to install it, use the following command in the terminal:

sudo apt-get update
sudo apt-get install openjdk-11-jdk

Once the installation is complete, you can verify the installation by using the following command:

java -version

The above command will display the version of Java installed on your system.

2. Installing Oracle Java

To install Oracle Java, you will need to download the package from the Oracle website and then install it using the terminal. The following steps outline the process:

a. Download the Oracle Java package

Go to the Oracle website and download the package for Linux. The package will be in the form of a tar archive.

b. Extract the tar archive

Use the following command to extract the tar archive:

tar xvf jdk-11.0.9_linux-x64_bin.tar.gz

c. Move the extracted folder to the /usr/lib/jvm directory

Use the following command to move the extracted folder:

sudo mv jdk-11.0.9 /usr/lib/jvm/jdk-11

d. Set the JAVA_HOME environment variable

Use the following command to set the JAVA_HOME environment variable:

sudo nano /etc/environment

Add the following line to the file:

JAVA_HOME="/usr/lib/jvm/jdk-11"

Save the file and close the editor.

e. Update the alternatives system

Use the following commands to update the alternatives system:

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-11/bin/java 100
sudo update-alternatives --config java

f. Verify the installation

Use the following command to verify the installation:

java -version

The above command will display the version of Java installed on your system.

In conclusion, installing Java on Ubuntu 20.04 is a straightforward process. By following the steps outlined in this article, you can install either the open-source version (OpenJDK) or the proprietary version (Oracle Java) on your system.

Popular questions

1. How do I remove OpenJDK from Ubuntu 20.04?
   Answer: To remove OpenJDK from Ubuntu 20.04, use the following command in the terminal: sudo apt-get remove openjdk-11-jre-headless.

2. How do I remove Oracle Java from Ubuntu 20.04?
   Answer: To remove Oracle Java from Ubuntu 20.04, use the following command in the terminal: sudo apt-get remove oracle-java11-installer.

3. How do I remove Java configuration files from Ubuntu 20.04?
   Answer: To remove Java configuration files from Ubuntu 20.04, use the following command in the terminal: sudo apt-get autoremove.

4. How do I verify that Java has been removed from Ubuntu 20.04?
   Answer: To verify that Java has been removed from Ubuntu 20.04, use the following command in the terminal: java -version. If Java has been successfully removed, the above command will display an error message indicating that Java is not installed.

5. Can removing Java from Ubuntu 20.04 affect other applications or services on my system?
   Answer: Yes, removing Java from Ubuntu 20.04 can affect other applications or services on your system if they are using Java. It is important to backup your important data before proceeding with the removal process and to consult with a knowledgeable person or seek assistance from the Ubuntu community forums if you are unsure about the impact of removing Java.

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Uninstallation