Public bug reported:

Dark purple (noise) background flashes up briefly (for a split second)
during the login animation.

The login screen and gnome-shell's system background are meant to be the
same image so that the login procedure can VT switch without the user
noticing. Then the final desktop expands over the system background.
However it appears the login background and system background are not
the same image any more, causing a visible glitch during login.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.30.0-3ubuntu1
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
Date: Wed Oct  3 14:42:34 2018
DisplayManager:
 
InstallationDate: Installed on 2018-05-26 (129 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180525)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Medium
         Status: New

** Affects: yaru-theme (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic regression visual-quality

** Also affects: yaru-theme (Ubuntu)
   Importance: Undecided
       Status: New

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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/1795802

Title:
  Dark purple (noise) background flashes up briefly during the login
  animation

Status in gnome-shell package in Ubuntu:
  New
Status in yaru-theme package in Ubuntu:
  New

Bug description:
  Dark purple (noise) background flashes up briefly (for a split second)
  during the login animation.

  The login screen and gnome-shell's system background are meant to be
  the same image so that the login procedure can VT switch without the
  user noticing. Then the final desktop expands over the system
  background. However it appears the login background and system
  background are not the same image any more, causing a visible glitch
  during login.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.30.0-3ubuntu1
  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
  Date: Wed Oct  3 14:42:34 2018
  DisplayManager:
   
  InstallationDate: Installed on 2018-05-26 (129 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180525)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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