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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1760598 Title: I/O Error after clicking "reboot now" - Ubuntu font missing from casper shutdown To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1760598/+subscriptions -- ubuntu-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs