How to Download and Install Oracle JAVA 8 on Ubuntu 18.04/16.04 LTS

In this article, We are going to perform How to Download and Install Oracle JAVA 8 on Ubuntu 18.04/16.04 LTS Manually.


Java is a set of software and specifications developed at Sun Microsystems. There are two tyes of Java Platforms are JDK (Java Development Kit) and JRE (Java Runtime Environment). Both are helpful for deploying applications on servers and debugging, JVM monitoring,developing.

Java 8 Features:

Java 8 provides following features,
  • ForEach() method
  • Functional interfaces
  • Base64 Encode Decode
  • Parallel array sorting
  • Nashorn JavaScript Engine,
  • Parallel Array Sorting
  • Type and Repating Annotations
  • java.lang and java.util Packages
To know more detailed features go through this link.


  • Ubuntu Server 18.04/16.04 LTS
  • SSH access with sudo privileges
To check Ubuntu version:
uname -a
cat /etc/os-release
cat /etc/os-release


VERSION="18.04.3 LTS (Bionic Beaver)"



PRETTY_NAME="Ubuntu 18.04.3 LTS"







Follow the below steps to Install Oracle Java 8 on Ubuntu Manually using command line.

Step #1: Download Oracle Java 8

Generally Oracle will not allow to download directly without accepting their licences. We have to create one account in Oracle java website by your personal or official mail. After accepting licence download the application from browser to local machine. This link takes you to the Oracle home website Oracel Java SRE. Once you opened above link goto “JAVA SE Development Kit 8u241” section, download “jdk-8u251-linux-x64.tar.gz” setup for Ubuntu click on “Accept License Agreement” Check Box. download oracle java 8 for ubuntu 20.04 LTS After downloading into local machine, using SCP/SFTP/FTP transfer the file from local machine to Ubuntu server.

Step #2: Copy downloaded Setup and Extract

Create a directory /opt/jdk
sudo mkdir  -p /opt/jdk
Copy the tar  file from the directory copied from local machine to server to /opt/jdk folder and execute below command:
sudo cp -rf /home/sivasai/jdk-8u251-linux-x64.tar.gz /opt/jdk/
cd /opt/jdk/
sudo tar -zxf jdk-8u251-linux-x64.tar.gz
Now unarchived the file and check the content by long-list:

Step #3: Install Oracle Java 8 on ubuntu with Alternatives

Use update-alternatives command to configure java on your system
sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_251/bin/java 100
After executing above command it shows below output:
update-alternatives: using /opt/jdk/jdk1.8.0_251/bin/java to provide /usr/bin/java (java) in auto mode
Note : Its not particularly o/p if you have installed open jdk before

Step #4: Verify Update Alternatives

Enter below command shows output:
sudo update-alternatives --display java
$ sudo update-alternatives --display java

java - manual mode

 link best version is /usr/lib/jvm/java-13-oracle/bin/java

 link currently points to /opt/jdk/jdk-13.0.2/bin/java

 link java is /usr/bin/java

slave java.1.gz is /usr/share/man/man1/java.1.gz

/opt/jdk/jdk-12.0.2/bin/java - priority 

/opt/jdk/jdk-13.0.2/bin/java - priority 1

/opt/jdk/jdk1.8.0_251/bin/java - priority 100

/usr/lib/jvm/java-13-oracle/bin/java - priority 1091

slave java.1.gz: /usr/lib/jvm/java-13-oracle/man/man1/java.1.gz
To change for alternative mode:
sudo update-alternatives --config java
It prompts for selecting by 0,1, choose accordingly:
There are 4 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                  Priority   Status


  0            /usr/lib/jvm/java-13-oracle/bin/java   1091      auto mode

  1            /opt/jdk/jdk-12.0.2/bin/java           2         manual mode

* 2            /opt/jdk/jdk-13.0.2/bin/java           1         manual mode

  3            /opt/jdk/jdk1.8.0_251/bin/java         100       manual mode

  4            /usr/lib/jvm/java-13-oracle/bin/java   1091      manual mode

Press <enter> to keep the current choice[*], or type selection number: 3

update-alternatives: using /opt/jdk/jdk1.8.0_251/bin/java to provide /usr/bin/java (java) in manual mode

Step #5: Setting the JAVA_HOME and JRE_HOME Environment Variables

To define the enviroment variable:
sudo  nano /etc/environment
Paste the below variable on the file:
To check variables defined:
source /etc/environment
sudo apt-get update

Step #6: Verify Java Version

To check the java version:
java -version
java version "1.8.0_251"
Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.251-b08, mixed mode)
If you seeing output like above then we have  successfully set up the Java 8 on Ubuntu.


In this article, We have downloaded Oracle Java 8 from official site, installed using command line, configured JAVA_HOME and JRE_HOME, verified installed version.

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Sivasai Sagar

I am working as DevOps Engineer and having 5 years of Experience. Likes to share knowledge.

31 thoughts on “How to Download and Install Oracle JAVA 8 on Ubuntu 18.04/16.04 LTS”

    • Hello Runkeish,
      Thanks for following our article. Please give read, write,and group permissions to /opt/jdk directory. Then you can move the files.
      $ sudo chmod -R 777 /opt/jdk
      Let me know if you still facing the issue.

  1. sudo update-alternatives –install /usr/bin/javac javac /opt/jdk/jdk1.8.0_231/bin/javac 100

    You might need to add this as we need javac!

  2. I have fallowed above all steps but still i am facing issue.
    while running the “java -version”.It was not showing jdk version.Could you please help me.

  3. I have fallowed above all steps but still i am facing issue.
    while running the “java -version”.It was not showing jdk version.Could you please help me.

  4. Hi Sivasai Sagar,

    Thanks for this clear cut procedure. I have followed and done commands with java, everything has gone well until the end. After that I have seen a comment and learnt that I need to use javac instead of java. now do I have to repeat the procedure till end with javac?


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