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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https://bugs.launchpad.net/bugs/1795802

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

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