[Bug 1939002] [NEW] after update (sudo apt full-upgrade) Cinnamon won't render

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After an update today (can't remember what was updated), Cinnamon
desktop renders only as grey and white rectangles, no text visible.  I
found a similar problem logged at
https://github.com/linuxmint/cinnamon/issues/10254, which suggested
"Report the issue to ubuntu against xorg or mesa."

Running:
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.35
ProcVersionSignature: Ubuntu 5.4.0-80.90-generic 5.4.124
Uname: Linux 5.4.0-80-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug  5 10:48:55 2021
InstallationDate: Installed on 2019-05-18 (809 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to focal on 2020-05-13 (448 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal third-party-packages
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after update (sudo apt full-upgrade) Cinnamon won't render
https://bugs.launchpad.net/bugs/1939002
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