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How to install Java 13 on Ubuntu 18.04.3 from terminal with sudo privildges?

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Followed https://openjdk.java.net/install/index.html per Pilot6 comment (thanks).

JDK 9 & Later

Oracle's OpenJDK JDK binaries for Windows, macOS, and Linux are available on release-specific pages of jdk.java.net as .tar.gz or .zip archives.

As an example, the archives for JDK 13 may be found on jdk.java.net/13 and may be extracted on the command line using

$ tar xvf openjdk-13*_bin.tar.gz

Commands to download java 15 from jdk net (Linux / x64) using terminal and saving to a folder in Downloads folder called 'j'. ~ is shortcut for current logged in user's home directory

mkdir ~/Downloads/j
cd  ~/Downloads/j
curl https://download.java.net/java/GA/jdk15.0.2/0d1cfde4252546c6931946de8db48ee2/7/GPL/openjdk-15.0.2_linux-x64_bin.tar.gz --output ./jdk_15.0.2_linuxx64bin.tar.gz
 tar xvf j16.tar.gz

Used sudo mv to move directory 'jdk-13.0.1' to /usr/lib/jvm/

  sudo mv jdk-16  /usr/lib/jvm/

Then in my ~/.profile file added/edited (as I had Java 11 before) in text editor:

export JAVA_HOME=/usr/lib/jvm/jdk-13.0.1
export PATH=$JAVA_HOME/bin:$PATH

In the current terminal gave above two commands and could use Java 13. Worked after restart too due to entry in ~/.profile

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