[Bug 1919139] [NEW] Kubuntu 20.04: System freeze upon session shutdown/restart/lock

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Whenever I shutdown, restart or lock my session, the OS becomes
unresponsive. I can still access ttys and shutdown successfully from
there. It might have something to do with my RTX 2060s graphics card,
but I remember installing the latest drivers.

Description:    Ubuntu 20.04.2 LTS
Release:        20.04

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: plasma-workspace 4:5.18.5-0ubuntu0.1
ProcVersionSignature: Ubuntu 5.8.0-44.50~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-44-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Mon Mar 15 11:33:25 2021
ExecutablePath: /usr/bin/plasma_session
InstallationDate: Installed on 2021-03-12 (2 days ago)
InstallationMedia: Kubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: plasma-workspace
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: plasma-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal
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Kubuntu 20.04: System freeze upon session shutdown/restart/lock
https://bugs.launchpad.net/bugs/1919139
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