You can find instructions on how to install OpenJDK 17 on Ubuntu 20.04 or 22.04 in a tutorial from Linux Capable.

How to Install OpenJDK 17 on Ubuntu 22.04 or 20.04

Learn how to install OpenJDK 17 (Java 17) on Ubuntu 22.04 Jammy Jellyfish LTS or Ubuntu 20.04 Focal Fossa using two different methods. Get detailed information on OpenJDK 17, including its popularity, use cases, history, and new features. Stay up-to-date with the latest security updates and easily switch between Java versions.

How to Install OpenJDK 17 on Ubuntu 22.04 or 20.04 - LinuxCapable