>Try to force reboot/power down earlier during the boot

Not possible.

This is the boot process:
1. push power button
2. type in decryption password
3. hit enter
4. you immediately receive the Ubuntu splash screen
5. more and more (but not all) red dots appear
6. system hangs at 3 or 4 red dots

It is not possible to act between steps 3 and 4.

>see also https://wiki.ubuntu.com/RecoveryMode

I have a fully duplicate backup test machine that manually mirrors my
main machine.

After the very first boot failure, I ported ALL the backup data to the
test machine from which all these notes are coming.

To reproduce all of the prior stated issues, I had to reinstall a new
19.04 from USB key.

There is nothing to recover, for me at least.

You are welcome to propose various tests on the failed machine.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1831514

Title:
  Ubuntu 19.04 system update causes boot failure

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  ***
  *** Please reassign bug to proper package
  ***

  On Jun 3 2019, the system update corrupts the system.  It will not
  boot.  It hangs on the 3rd red dot of the Ubuntu splash screen.  The
  remaining 2 dots are white.  You never get the terminal screen with
  green [ ok] status lines.

  A complete new install works fine.  When you do a system update, you
  get the corruption and boot failure.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: gedit 3.32.0-3
  ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
  Uname: Linux 5.0.0-13-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jun  3 21:12:08 2019
  InstallationDate: Installed on 2019-04-14 (50 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190413.2)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gedit
  UpgradeStatus: No upgrade log present (probably fresh install)

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