Public bug reported:

This is a fresh install of 2020.04.
Issue is that the display routinely gets corrupted and flickers with blocks of 
previously open windows. 
If left without a restart, the system menu text will get replaced by odd 
characters and system dialog boxes will not display, buttons for the dialog 
boxes will briefly appear with no text when cursor is over them.
Very occasionally, the system will stop responding to the mouse and keyboard 
after clicking an icon on the dash.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.1-5ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul  5 15:24:13 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-05-03 (63 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

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

** Tags: amd64 apport-bug focal wayland-session

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  Display gets corrupted and text gets replaced by odd characters

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