Comment 8 for bug 1760598

As explained in Bug #1761478 that would still leave timing issues. With --ping not blocking anymore casper-stop can shoot right past the prompt code on account of --ping coming back !0 (if plymouth isn't quick enough to start anyway). Meaning the user doesn't get told to remove the installation medium.

e.g. this is what I get in a VM now http://people.ubuntu.com/~apachelogger/screencasts/vokoscreen-2018-04-06_13-40-13.mkv