Install JDK 20 in Ubuntu:

install_jdk_20_ubuntu.md

How to install JDK 20 on Ubuntu

1. Download the x64 Debian package from Oracle https://www.oracle.com/java/technologies/downloads/

2. Install the .deb package.

sudo apt install ~/Downloads/jdk-20_linux-x64_bin.deb

3. Set JDK 20 as defaults:

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-20/bin/java 1
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-20/bin/javac 1
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-20/bin/jar 1

4. Set JDK as defaults (continued):

When you run these commands, a select dialog comes up, enter the number that corresponds to the JDK 20 file path.

sudo update-alternatives --config java
sudo update-alternatives --config javac
sudo update-alternatives --config jar

5. All done!

Verify which version of Java is installed with this command:

java -version

If all is correct, it should be JDK 20 :)