Import the official AdoptOpenJDK GPG key
Import the AdoptOpenJDK DEB repo using add-apt-repository


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

sudo add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/

sudo apt update

ONE OF THESE

sudo apt install adoptopenjdk-8-hotspot  # Java 8 / HotSpot VM
sudo apt install adoptopenjdk-8-openj9   # Java 8 / OpenJ9 VM
sudo apt install adoptopenjdk-11-hotspot # Java 11 / HotSpot VM
sudo apt install adoptopenjdk-11-openj9  # Java 11 / OpenJ9 VM
sudo apt install adoptopenjdk-12-hotspot # Java 12 / HotSpot VM
sudo apt install adoptopenjdk-12-openj9  # Java 12 / OpenJ9 VM
sudo apt install adoptopenjdk-13-hotspot # Java 13 / HotSpot VM
sudo apt install adoptopenjdk-13-openj9  # Java 13 / OpenJ9 VM


sudo update-alternatives --config java
sudo update-alternatives --config javac