GNU/Linux Ubuntu 20.04 Installing GlassFish 6.2.5 Guide
The linked tutorial shows you step-by-step How to Install Eclipse GlassFish 6.2.5 in Ubuntu 20.04 Focal LTS GNU/Linux desktop/server.
And Eclipse GlassFish 6.2.5 for Ubuntu Focal provides a Complete Application Server which serves as the Reference Implementation for the Jakarta EE Specification.
Moreover, Eclipse Glassfish includes a Complete Administration Console, Clustering Support, and other Developer and Production focused Tools and Features.

Eclipse GlassFish 6.2.5 Ubuntu 20.04 Installation Guide