What should I use for java (11) on my Ubuntu VPS?
openjdk (headless) or official Oracle java?
I see Oracle wants payment for use on commercial servers (how much?).
I have had issues using openjdk (in the past) when headless.
Having an issue now trying to SSL (TLS) a server with ABM and Jetty (using openjdk - headless - (whatever that means?).
I don't understand your response?
What should I install - where to get, and how (on Ubuntu)?
Everything is so "command line".
If you can't find the correct method on Google - one often shoots themself in the right foot (until you blow ALL your toes off - then you start working on the other foot).