Update 2

I used the Heimdall install which also installs docker before installing Heimdall.

Install Redux

I used the Pi My Life Up procedure to install the docker version of Heimdall. It required installation of docker on my Ubuntu 22.04 server.

Original Install

I did the Docker install that worked until I rebooted. I started over using the Variable How-Tos tutorial. This procedure installed PHP 7.4.3 but PHP 7.4.32 was required. I found the update process using the DigitalOcean procedure. It added the Personal Package Archives:ondrej/php or ppa:ondrej/php repository so I could include it as an additional software source. Then I was able to update/upgrade to php 7.4.33. I also had to install php7.4-cli to use the PHP command line.

I edited /etc/systemd/system/heimdall.service adding the suggest configuration. I changed the user, group and working directory to mine. I changed the –port to 8443 and added — host 0.0.0.0. The last catch was to not use https in the url: http://<ip addr>:8443. I think my previous Heimdall bookmark failed because I used https. Hopefullly, a lesson learned. This is my work in progress: