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Problem with my Wife computer (URGENT!!).

When she want to shutdown computer from KDE GUI, it does shutdown computer but logout user from system and login screen appears. What I have to correct situation?

Maybe have a look at:
KDE System Settings-> Startup and shutdown-> Session Management-> Offer shutdown options

I have several M5 based PC and all of them has KDE configured the way You show in Your post. Including that one with "strange" shutdown problem.
I have to mention once more. The problem is that I click on "Zakończ" (that is "End session") in M5 main panel and than "Shutdown". But the PC logout user (to user login screen) instead shutdown system.

Sometimes see this symptom when pre-release testing new releases. It's normally an issue with polkit.

$ ps -e | grep polkit
1072 ? 00:00:00 polkitd
3395 ? 00:00:00 polkit-kde-auth

OK. But I have several M5 based PC. Apart from the fact that different hardware, installation everywhere M5 is identical. And this is strange. Because all four PC behave properly. With the exception of one.

So what? Others maintain several dozen similar installations, and only one machine misbehaves in unexpected ways.

At the very least provide the output of the following commands, run as your regular user in a terminal:

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loginctl show-session $XDG_SESSION_ID
ps -ef|grep -v grep|grep -iE "polkit|policykit"
pkexec whoami     # you need to enter your root password when asked by the authentication dialog
echo $DISPLAY

and as root from:

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systemctl status polkit.service -a

doktor5000 wrote:So what? Others maintain several dozen similar installations, and only one machine misbehaves in unexpected ways.

Yes, exactly.

Below outputs:

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[gosia@gosia ~]$ loginctl show-session $XDG_SESSION_ID
Id=c1
Name=gosia
Timestamp=śro 2016-06-15 16:07:01 CEST
TimestampMonotonic=35908189
VTNr=1
Display=:0
Remote=no
Service=kdm-np
Scope=session-c1.scope
Leader=1499
Audit=0
Type=x11
Class=user
Active=yes
State=active
IdleHint=no
IdleSinceHint=0
IdleSinceHintMonotonic=0
[gosia@gosia ~]$ ps -ef|grep -v grep|grep -iE "polkit|policykit"
polkitd   1334     1  0 16:06 ?        00:00:00 /usr/lib/polkit-1/polkitd --no-debug
gosia     2505     1  0 16:07 ?        00:00:00 /usr/lib64/kde4/libexec/polkit-kde-authentication-agent-1
[gosia@gosia ~]$ pkexec whoami
root
[gosia@gosia ~]$ echo $DISPLAY
:0
[gosia@gosia ~]$

and

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[gosia@gosia ~]$ systemctl status polkit.service -a
● polkit.service - Authorization Manager
   Loaded: loaded (/usr/lib/systemd/system/polkit.service; static)
   Active: active (running) since śro 2016-06-15 16:07:00 CEST; 1h 53min ago
     Docs: man:polkit(8)
 Main PID: 1334 (polkitd)
   CGroup: /system.slice/polkit.service
           └─1334 /usr/lib/polkit-1/polkitd --no-debug
[gosia@gosia ~]$

Seems alright regarding polkit, system daemon is running. your logind session is considered active and a polkit agent is running for your user.

What happens if you run the following command as your regular user?

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qdbus org.kde.ksmserver /KSMServer logout 0 0 0

It logouts user and login screen appears.

Well, that is the command that is run for the log off command, so it's working in general, you could create a desktop shortcut for that command as mitigation, that way you'd also have to click less

Does your wife maybe use the quick user switch, or is there only one user using that box? Does the problem persist under a newly created user?

Well. M5 is not housewife proof
So, I created of course shortcut for quick computer shutdown. My wife is the only user of that laptop, but I will create another user to test it.

Yep. Workaround that is "STOP" icon on screen and shutdown script associated with the icon, resolved problem. In my wife meaning of course. Nothink more to be happy