Public bug reported:

After upgrading from 19.10 to 20.04 I am seeing blocky green and purple
artefacts on icons, background images and text. This is visible on the
login screen and once logged in.

Only the "shell" is corrupted and any subsequent changes, such as
changing the background image, are displayed without corruption. The
corruption is random but it is predictable that it will appear on the
launcher icons, background image and shell menu icons and text.

I've tried swapping between available graphics drivers but it makes no
difference.

Text corruption in menus is on particular glyphs selected at random. In
the screen shots, for example, all upper-case and lower-case 'O's are
currupted but on a subsequent reboot the affected glyphs will vary. On
filing this bug I also notice that the pop-up modal password requests
also displayed the corrupted glyphs. No programms run subsequently will
display any problems.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.64  Fri Feb 21 01:17:26 
UTC 2020
 GCC version:  gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 28 14:29:39 2020
DistUpgraded: 2020-04-24 15:49:16,469 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus: nvidia, 440.64, 5.4.0-26-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation UHD Graphics 630 (Mobile) [8086:3e9b] (prog-if 00 [VGA 
controller])
   Subsystem: Dell UHD Graphics 630 (Mobile) [1028:0905]
   Subsystem: Dell TU117M [GeForce GTX 1650 Mobile / Max-Q] [1028:0905]
InstallationDate: Installed on 2019-12-05 (144 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Dell Inc. XPS 15 7590
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-26-generic 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to focal on 2020-04-24 (3 days ago)
dmi.bios.date: 02/06/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.6.0
dmi.board.name: 0VYV0G
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.6.0:bd02/06/2020:svnDellInc.:pnXPS157590:pvr:rvnDellInc.:rn0VYV0G:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 7590
dmi.product.sku: 0905
dmi.sys.vendor: Dell Inc.
nvidia-settings:
 ERROR: Unable to load info from any available system
 
 
 ERROR: Unable to load info from any available system
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.4-2ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug corruption focal ubuntu

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https://bugs.launchpad.net/bugs/1875645

Title:
  Graphics corruption on shell on login screen and session screen

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