====== Java 8: ======
<code>
sudo add-apt-repository ppa:webupd8team/java
sudo apt update
sudo apt install oracle-java8-installer
sudo apt install oracle-java8-set-default
</code>

====== Java 10: ======
<code>
sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java10-installer
</code>