I'd love to try Nix. But, I'm using an Nvidia Jetson environment, which is based on a preinstalled Ubuntu 18.04, probably with lots of specific driver configurations that I don't want to touch (or reinvent). I've also learned that running Nix on top of Ubuntu is not the greatest idea, see e.g. [1].
[1] https://news.ycombinator.com/item?id=16443323