1. To add the PPA, open terminal either from app launcher or by pressing Ctrl+Alt+Ton keyboard. When it opens, run command:
sudo add-apt-repository ppa:linuxuprising/java
Type user password (no asterisks feedback) for sudo prompt and hit Enter.
2. Then run commands to install the script to start downloading and installing Java 11 on your Ubuntu:
sudo apt-get update sudo apt-get install oracle-java11-installer
For Ubuntu 18.04 and higher, skip sudo apt-get update command since it’s done after adding PPA.
Before getting started, you must accept the license (press Tab to highlight OK and hit Enter).
3. If you have installed multiple Java versions, install (or remove) oracle-java11-set-default package to set (or not set) Java 11 as default.
sudo apt-get install oracle-java11-set-default
Finally check Java version via java -version:
Uninstall:
To remove Oracle Java 11, run command to remove the installer script:
sudo apt-get remove oracle-java11-installer
And go to Software & Updates -> Other Software to remove the PPA repository.