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Following an upgrade from 18.04 to 20.04 when I boot, X windows comes to
a point where I get a white background with a bunch of colored dots.
Nothing progresses from there.

I can boot successfully by pressing escape after booting, going to
advanced options, booting to 5.4.0-29 recovery mode.  When that menu
appears, I select "root".  I press Enter for maintenance.

When the root prompt appears I immediately type EXIT to return to the
menu and then RESUME followed by OK.

The system then starts the desktop properly.

I would be happy to provide boot logs and/or Xorg.0.logs if desired.  It
appears to me that there are out of memory errors occurring along with
some addressing issues.

I am on an HP EliteBook 8570w laptop 15.6 G memory.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.19
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun May 10 10:22:37 2020
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-09-22 (595 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeAptlog:
 Log time: 2020-05-09 09:07:41.355959
 Starting pkgProblemResolver with broken count: 0
 Starting 2 pkgProblemResolver with broken count: 0
 Done
 None

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


** Tags: amd64 apport-bug dist-upgrade focal
-- 
X windows hnags following upgrade from 18.04 to 20.04
https://bugs.launchpad.net/bugs/1877871
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