@vanvugt, new GDM bug has been created here:
https://gitlab.gnome.org/GNOME/gdm/issues/408

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https://bugs.launchpad.net/bugs/1767918

Title:
  Login password from GDM is shown in plain text on the VT1 console

Status in gdm3 package in Ubuntu:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  https://gitlab.gnome.org/GNOME/gdm/issues/408

  ---

  I don't which package this applies to, but I believe the best bet is
  GDM.

  Steps to reproduce:
  1) Log-in using X11 login via GDM.
  2) Use the desktop for a while.  (For some reason I cannot reproduce if I 
login and then restart after a short while).
  3) In Gnome click System menu -> Power Button -> Restart
  4) Quickly press CTRL-ALT-F1
  5) I see my login password in plain text in the console.  Once I saw the 
login password repeated twice.

  See attached photo with the login password blanked out.  Below the
  password is the console cursor.

  ## lsb_release -rd
  Description:  Ubuntu 18.04 LTS
  Release:      18.04

  ## apt-cache policy gdm3
  gdm3:
    Installed: 3.28.0-0ubuntu1
    Candidate: 3.28.0-0ubuntu1
    Version table:
   *** 3.28.0-0ubuntu1 500
          500 http://nz.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gdm3 3.28.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-18.19-generic 4.15.17
  Uname: Linux 4.15.0-18-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 30 14:54:07 2018
  InstallationDate: Installed on 2018-04-13 (17 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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