On Ubuntu Ubuntu 14.04, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 20.10
Firstly add the repository
sudo add-apt-repository ppa:linuxuprising/java
Now update the cache and install java
sudo apt update
sudo apt install oracle-java16-installer
You have the possibility to not set java 16 as default, just type this instead
sudo apt install oracle-java16-installer --no-install-recommends
You will be asked to agree to the license agreement, tab and choose “ok“
and if you want to remove the ppa
sudo add-apt-repository --remove ppa:linuxuprising/java
and you can also completely remove java 16 again with this command
sudo apt-get remove oracle-java16-installer
But that would kinda ruin the whole exercise of installing it in the first place.
Enjoy!