How to properly install Oracle Java 8 on Ubuntu?

Question

I would like to install Oracle Java 8 on my Ubuntu 18.04 using packages. I already added the apt-repository, but when trying to install it says package is not available. All I do is:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

Then it says:

Package oracle-java8-installer is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source

E: Package 'oracle-java8-installer' has no installation candidate

Maybe the package has already been deleted and is not available now?

Answer 1

sudo apt install openjdk-8-jdk openjfx should do the trick. It will get you JavaFX for OpenJDK.

Read more at https://askubuntu.com/questions/1091157/javafx-missing-ubuntu-18-04

Answer 2

Others have mentioned to install openjdk-8.
After that---> Get jfxrt.jar file from https://github.com/qweasdzxcpoi/JavaFX
Do sudo nautilus.
And put it in your /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext
This personally worked for me when all the other commands were not working for some reason idk.
After that rebuild your project.