TecMint published a tutorial about enabling HTTP/2 in Apache on Ubuntu.

How to Enable HTTP/2 in Apache on Ubuntu

Since the inception of the World Wide Web (www), the HTTP protocol has evolved over the years to deliver secure and fast digital content over the internet. The most widely used version is HTTP 1.1 and while it packs with feature enhancements and performance optimizations to address the shortcomings of earlier versions, it falls short of a few other salient features that have been addressed by the HTTP/2.

How to Enable HTTP/2 in Apache on Ubuntu