[Bug 1795882] Re: "Remove media" message is not displayed after installation

[Steve Langasek]

- the casper service is racing plymouth; it doesn't wait for plymouth-reboot.service to have started before it checks to see if plymouth is available, so if plymouth is slow to start up, casper may write its message only to the console.
 - casper is writing to a different tty than the one plymouth runs on, because plymouth in shutdown mode defaults to running on tty63 - not tty1 which was used for everything at boot, and which casper writes its 'backup' message to.
 - if you do change VTs to tty1 and see the 'fallback' message telling you to reboot, you can't just press enter, because we're only listening to plymouth in this case, and not the tty.  This is why a different message is displayed (as Dimitri mentions).
 - because we're calling plymouth --ping at two different times, we can actually get two different answers, especially since we're currently racing.  So you can wind up with casper only writing the message to the console, and then listening for an answer via plymouth, and nobody's happy.

I think it is important that we fix the race by ensuring the casper
service always starts after plymouth-reboot.service.  I've raised an MP
for this.

But I don't know if that's actually going to fix the bug reported here
(which seems to actually be a metabug, describing different symptoms on
UEFI vs BIOS).

Jean-Baptiste, can you please clarify:
 - what environment you see this behavior in (KVM? VirtualBox? Bare metal?  UEFI or BIOS?)
 - what is the exact message you see on the console when you press alt-right 5 times

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https://bugs.launchpad.net/bugs/1795882

Title:
  "Remove media" message is not displayed after installation

Status in casper package in Ubuntu:
  New

Bug description:
  Cosmic Desktop 20181003

  After installation the message to remove the installation media and
  reboot is not always displayed. Instead there is a black page with a
  blinking cursor on the top left. The message can be displayed by
  pressing alt-right_arrow 5 times.

  On a UEFI installation, even if the text message is displayed, the
  user cannot reboot and have to switch to the purple page to actually
  be able to reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7
  Uname: Linux 4.18.0-8-generic x86_64
  ApportVersion: 2.20.10-0ubuntu11
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct  3 14:17:56 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  InstallationDate: Installed on 2018-10-03 (0 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20181003)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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