You are correct, I tried it on fresh Ubuntu 16.04 and it worked.
I didn’t spend the time to pinpoint the exact error, but removing the old config (get rid of /opt/fog/.fogsettings) is letting the installer run, so this particular issue is fixed.
@sebastian-roth I was referring to my intended use case. I want to capture an image from a computer and automatically copy the individual files from the image onto a file server. In order to do that, I need a script that runs on the server, not the host. I could find a way to trigger it still (some primitive form of RPC, maybe a quick HTTP request with wget), but it wouldn’t be quite as convenient.