Alon Gal's notes

https://www.youtube.com/watch?v=8OM_eqRAsMM
https://develike.com/en/articles/configuring-apache-to-support-php-fpm-on-debian-ubuntu
https://helgeklein.com/blog/2018/11/enabling-http-2-in-apache-on-ubuntu-18-04/

This is only available on Apache2.4.17 and above.
It will only work on Ubuntu 16.04 and above.

1 . First check the apache version

apache2 -v  

2 . If need to upgrade do the following

sudo add-apt-repository ppa:ondrej/apache2
sudo apt-get update
sudo apt-get install apache2 -y

3 . Now you can enable http2 mod

sudo a2enmod http2

4 . And put this directive in your sites-available/000-default.conf file

Protocols h2 http/1.1

5 . Restart apache

sudo service apache2 restart