[Bug 1900776] [NEW] can't log back in after sleep/lock

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After upgrading to 20.04.1 LTS, when the display goes to sleep and the
session locks, I can't log back in.  An incorrect password is notified
as such, but the correct password blanks the screen.  When I move the
mouse, the login prompt re-appears.

If I lock the session manually, login works fine.  Also, I can log in
remotely to reboot the machine.

This was not a problem before the upgrade from 18.??

Not sure if this bug resides ubuntu or xfce or what.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.28
ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65
Uname: Linux 5.4.0-51-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Tue Oct 20 15:31:57 2020
InstallationDate: Installed on 2018-07-23 (820 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to focal on 2020-10-19 (1 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade focal
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can't log back in after sleep/lock
https://bugs.launchpad.net/bugs/1900776
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