Installed Ubuntu on the chroot ‘partition’, using crouton, on ChromeOS. But it turns out, docker doesn’t want to work. It’s loosely related to these issues:
https://github.com/docker/for-linux/issues/689
https://github.com/moby/moby/issues/33594
It’s not necessarily a deal-breaker, but it is super lame.
There are other options for Linux, so will try them. https://chrx.org/ and GalliumOS in the next attempt. Dual-boot.
Another interesting attempt is here, where a guy recompiles the ChromeOS kernel with the config variables that docker is not finding. https://gist.github.com/christianbundy/ba62890a7c2f8128bcbb