In this tutorial, you learned how to install Java Runtime Environment ( JRE) and the Java Developer Kit ( JDK) on Ubuntu 20.04 and Ubuntu 18.04. You will get the following output: /usr/lib/jvm/java-11-openjdk-amd64 Verify that the environment variable is set: $ echo $JAVA_HOME Save the file and reload the file to apply the changes to your current session: $ source /etc/environment Then open /etc/environment file using nano text editor: $ sudo nano /etc/environmentĪdd the following line at the end of the file, make sure to replace the location of your Java installation path. You will get the following output: /usr/lib/jvm/java-11-openjdk-amd64/bin/java To set the JAVA_HOME environment variable, first, discover where Java is installed by running the following command. Most of the Java-based software programs use the JAVA_HOME environment variable to discover the Java installation location. Setting the JAVA_HOME Environment Variable in Ubuntu You will get the following output: javac 11.0.10 Is Ubuntu 14.04 still supported Ubuntu Linux 14.04 LTS no longer supported by vendor Ubuntu Linux 14. $ sudo apt install default-jdkĪfter installation, verify the JDK installation by checking the version as shown. To install the JDK, run the following command. Once JRE installed, you might also need the JDK ( Java Development Kit) in order to compile and run a Java-based application. OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing) OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04) You will get the following output: openjdk version "11.0.10" Once Java installed, you can verify the installation with: $ java -version Now run the following command to install the default OpenJDK 11, which will provide Java Runtime Environment ( JRE). Sudo apt install openjdk-8-jre-headless # version 8u282-b08-0ubuntu1~20.04 This is where the big problems are because not every intel bios supports headless boot, with some bios it wont boot if there is no video attached. Sudo apt install default-jre # version 2:1.11-72 After days of struggling this is how I came up with a functioning solution of a headless ubuntu server 14.04.2 on a NUC DN2820FYK. Command 'java' not found, but can be installed with: If Java is not currently installed, you will get the following output.
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