[Bug 1817418] [NEW] Crash "ksmserver-logout-greeter" or other KDE packages plasma after an update

[Emanuele]

Public bug reported:

I do not know which package is causing the problem, so I assigned it to "kubuntu-desktop".
It is a problem that has been repeating for a long time (kubuntu 18.04, 18.10 and 19.04), every time I update (I do not know exactly which package causes the problem) when I click on "restart" or "switch off" the "ksmserver-logout-greeter" "crashes, so to reboot or shut down I have to type from the terminal: sudo systemctl reboot.
Trying to start "plasma-discover" crashes as well.
I enclose all the logs that created the error reporting software.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: kubuntu-desktop 1.383
ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
Uname: Linux 4.19.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu21
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Feb 23 15:59:39 2019
InstallationDate: Installed on 2019-02-18 (4 days ago)
InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190130)
SourcePackage: kubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: kubuntu-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco

** Attachment added: "ksmserver-logout-greeter-20190223-155451.kcrash.txt"
   https://bugs.launchpad.net/bugs/1817418/+attachment/5241152/+files/ksmserver-logout-greeter-20190223-155451.kcrash.txt

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https://bugs.launchpad.net/bugs/1817418

Title:
   Crash "ksmserver-logout-greeter" or other KDE packages plasma after
  an update

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