This is the guide for you: https://www.linuxuprising.com/2021/09/how-to-install-oracle-java-17-lts-on.html If it doesn't work, you should provide more info, specifically what exactly you type in console, and what error you're getting. More on reddit.com

Why THE HECK IS THERE NOT A BASIC INSTALLER FOR JAVA the package manager can install java... now WHICH java you specifically need... No idea. but the basics will be the same. https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-ubuntu-20-04 java -version If Java is not currently installed, you’ll see the following output: Output Command 'java' not found, but can be installed with: sudo apt install default-jre # version 2:1.11-72, or sudo apt install openjdk-11-jre-headless # version 11.0.7+10-3ubuntu1 sudo apt install openjdk-13-jre-headless # version 13.0.3+3-1ubuntu2 sudo apt install openjdk-14-jre-headless # version 14.0.1+7-1ubuntu1 sudo apt install openjdk-8-jre-headless # version 8u252-b09-1ubuntu1 Execute the following command to install the default Java Runtime Environment (JRE), which will install the JRE from OpenJDK 11: sudo apt install default-jre The JRE will allow you to run almost all Java software. note: i think you only install ONE of the above packages.. :) unless you know you need more than one version of java.. (i have not messed with java in years) No idea what specific java needs your game may require.. Note - on Ubuntu 20.10 I get the following.. java --version Command 'java' not found, but can be installed with: sudo apt install default-jre # version 2:1.11-72, or sudo apt install openjdk-11-jre-headless # version 11.0.9.1+1-0ubuntu1~20.10 sudo apt install openjdk-8-jre-headless # version 8u275-b01-0ubuntu1~20.10 (You will have to enable component called 'universe') sudo apt install openjdk-13-jre-headless # version 13.0.4+8-1 (You will have to enable component called 'universe') sudo apt install openjdk-14-jre-headless # version 14.0.2+12-1 (You will have to enable component called 'universe') sudo apt install openjdk-15-jre-headless # version 15+36-1 (You will have to enable component called 'universe') the 'universe' they mention is the universe repository in the package manager settings. Otherwise - i think it will install openjdk-11 which is in the default repositories. PS: guides that mention the webup8 repositories - are likely outdated. the webup8 site has stopped hosting the non-free java stuff in their repos due to Licensing changes Installing Oracle JDK 11 Oracle’s licensing agreement for Java doesn’t allow automatic installation through package managers. To install the Oracle JDK, which is the official version distributed by Oracle, you must create an Oracle account and manually download the JDK to add a new package repository for the version you’d like to use. Then you can use apt to install it with help from a third party installation script. More on reddit.com

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OpenJDK: sudo apt install openjdk-8-jdk More on reddit.com