Some what embarrassingly, I have to admit that my blog install was way out of date. It was running an ancient version of WordPress on an ancient version of Ubuntu.
So, I upgraded both, with a big hat tip to Digital Ocean’s numerous tutorials (here is a good place to start.) They were equally helpful in setting up a VM for test driving stuff locally and getting things on the air with a new Digital Ocean droplet.
Also, along the way I added SSL for your secure viewing pleasure. Let’s Encrypt setup is pretty trivial these days. I should have done that a long time ago.