Installing JAVA on ubuntu can be done using following easiest command. for Ubuntu 20.04, this command installs OpenJDK 8 as we can see details in additional packages installed. $ sudo apt-get install default-jdk The following additional packages will be installed: The following additional packages will be installed: default-jdk-headless default-jre default-jre-headless The following NEW packages will be installed: default-jdk default-jdk-headless default-jre default-jre-headless Now, you can check the version of JAVA installed on your Ubuntu.

Command line execution

Terminalbash
sudo apt-get install default-jdk  The following additional packages will be installed: The following additional packages will be installed:   default-jdk-headless default-jre default-jre-headless The following NEW packages will be installed:   default-jdk default-jdk-headless default-jre default-jre-headless Now, you can check the version of JAVA installed on your Ubuntu. $  java -version openjdk version "1.8.0_275" OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~18.04-b01) OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode)

Risk level: destructive. Review the command before running it.

Implementation details

$ java -version openjdk version "1.8.0_275" OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~18.04-b01) OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode)

Gotchas and common issues

  • Permission checks - verify user access rights and sudo privileges before executing system-level operations.

  • Environment configuration - double-check path variables and dependency versions to prevent runtime failures.

  • Backup safeguards - maintain configuration backups before applying system or database modifications.

Following these steps ensures clean configuration and reliable execution for install java using apt-get command on ubuntu.