Скачать или смотреть How to Install Oracle Java 8 / 9 in Ubuntu 16.04, Linux

1. Add the PPA.
Open terminal (Ctrl+Alt+T) and run the command:
sudo add-apt-repository ppa:webupd8team/java
2. Update and install the installer script:
Run commands to update system package index and install Java installer script:
sudo apt update; sudo apt install oracle-java8-installer
3. Check the Java version
To check the Java version after installing the package, run command:
javac -version
4. Set Java environment variables
The PPA also contains a package to automatically set Java environment variables, just run command:
sudo apt install oracle-java8-set-default

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