I was discussing this with a coworker and we had a few questions.
1) the output message sounds like it's from the install log, do you jump to alt+f9 during the install when it shows the keypress?
2) the message is from the interactive part of the setup for the ampadmin (ampcli user that replaces root) - do you ever see the input fields for username / password?
If you're viewing the log, you should be able to jump back to the interactive input request with alt+f1. So if #2 sounds new - it's mostly because the tail log screen is just that - an output to stdout on that view output of the install log. Or you could just run a new install - and ignore that prompt to jump screens to watch the logging - which might be the next step if you happened to blow the original install instance away already.