Ubuntu 20.04 LTS - Installing OpenJDK 11 (LTS) JDK, JRE and HotSpot by AdoptOpenJDK

Ubuntu 20_04 LTS - Installing OpenJDK Any Version by AdoptOpenJDK (JDK-JRE-HotSpot).md

Reference:

https://adoptopenjdk.net/installation.html#linux-pkg ctrl + f => Linux RPM and DEB installer packages

1. Check ubuntu codename

$ cat /etc/os-release | grep UBUNTU_CODENAME

2. $ sudo apt-get install wget apt-transport-https gnupg

3. $ wget -qO - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | sudo apt-key add -

4. $ echo "deb https://adoptopenjdk.jfrog.io/adoptopenjdk/deb focal main" | sudo tee /etc/apt/sources.list.d/adoptopenjdk.list

5. $ sudo apt-get update

6. $ sudo apt-cache search adoptopenjdk

7. Select your version number, see reference link above for available version number
   I'll be using version 8 so the command would be:
   sudo apt-get install adoptopenjdk-8-hotspot

$ sudo apt-get install adoptopenjdk-<YOUR-VERSION-NUMBER-HERE>-hotspot

8. Check java if exising

$ java -version

• Output should be same as below

openjdk version "11.0.10" 2021-01-19
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.10+9)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.10+9, mixed mode)