Probable packaging problem: Single-click not working

Status changed to 'Confirmed' because the bug affects multiple users.

I can confirm that the single click does not work anymore since the last update.
It worked previously in 15.04 (Kubuntu vivid) !!

I can also confirm this.

The problem only affects applications based on kdelibs4, KDE 5 applications properly accept single clicks.

There are upstream bugs concerning this issue, but Plasma 5.2 should have fixed it:

https://bugs.kde.org/show_bug.cgi?id=343418
https://bugs.kde.org/show_bug.cgi?id=346946

So apparently it's a Kubuntu-specific issue? Or the assumption stated in https://bugs.kde.org/show_bug.cgi?id=346946#c3 is wrong.

https://bugs.kde.org/show_bug.cgi?id=343418

--- Comment #10 from michael x-x at x-x karbach.org ---
Not, I have altogether 5 Computers, 4 of them running OpenSuSE-13.2 and I do
not have the problem, but on my single computer with Ubuntu-15.04 I have the
problem with single click.

Same here

it used to work in Kubuntu 15.04

and stopped working after I upgraded to 15.10

Strangely enough, it works when I try a live Kubuntu 15.10 system on a USD drive, on the same laptop

I haven't found any workaround yet

Upgrading to kubuntu 15.10 solved the issue

On Sun, Nov 15, 2015 at 12:28 PM, sanette <email address hidden>
wrote:

> Same here
>
> it used to work in Kubuntu 15.04
>
> and stopped working after I upgraded to 15.10
>
> Strangely enough, it works when I try a live Kubuntu 15.10 system on a
> USD drive, on the same laptop
>
> I haven't found any workaround yet
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1451564
>
> Title:
> Single-click not working
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/kde-baseapps/+bug/1451564/+subscriptions
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> Upgrading to kubuntu 15.10 solved the issue

again, not for me.
with dolphin (which I assume is a kde5 app) single click doesn't work
with dolphin4 (which I assume is a kde4 app), single click works

same for this other user on Arch Linux:
https://forum.kde.org/viewtopic.php?f=225&t=129082

@sanette: That's exactly the opposite problem of what I observe - for me, single click works in KDE 5 applications, but not KDE 4 applications. See comments #4 / #5...

Also, for me it neither works with Kubuntu 15.04 nor 15.10.

For me it does not work in Kdevelop and, most irritating of all, the file picker.

In the upstream bugtracker someone mentioned that this bug may be caused by a specific packaging problem / a missing library:

https://bugs.kde.org/show_bug.cgi?id=343418#c16

****************************************************************************************************
Wolfgang Bauer 2016-04-19 22:34:28 UTC

FYI, I found out by chance what the likely reason for your problem is:
You probably miss the file /usr/lib/kde4/plugins/gui_platform/libkde.so (the path might be slightly different in Kubuntu).
This is needed so that Qt4 (and KDE4) applications actually use the KDE(4) settings.
Without it, only Qt4's settings are respected. You could use qtconfig to set the style e.g. but there's no option for single/double click.

This file is provided by the KDE4 desktop/workspace package (kde-workspace or similar). In openSUSE it's part of the subpackage kdebase4-workspace-libs which is still included and installed by default (it can be installed alongside Plasma5, unlike the actual KDE4 desktop).
No idea whether it's available in Kubuntu, or in which package it would be contained.

But maybe somebody could add this information to the Kubuntu bug report, I don't have an account.
****************************************************************************************************

In fact this library is missing on my system and apt-file also does not know about it at all:

$ ls -l /usr/lib/kde4/plugins/gui_platform/libkde.so
ls: Zugriff auf /usr/lib/kde4/plugins/gui_platform/libkde.so nicht möglich: Datei oder Verzeichnis nicht gefunden
$ apt-file search libkde.so
$

According to https://bugs.kde.org/show_bug.cgi?id=343418#c16 , a packaging problem in kdelibs5-plugins (which contains compatibility plugins) might be the culprit.

I experience the same problem after upgrading from kubuntu 14.04 LTS to 16.04 LTS.

KDE Plasma Version 5.5.5
Qt Version 5.5.1
Kernel Version 4.4.0-31-generic

I have the same problem on one of two computers, both upgraded from Ubuntu 14.04 to 16.04. The only difference I can think of is that one had kubuntu-desktop installed before the upgrade, the other one only after. They both run plasma 5.5.5, Qt 5.5.1.

Hi, I have the same problem on KUbuntu 16.04.5 LTS

Also have this problem in Kubuntu 16.04(.5). Just upgraded from 14.04.
No fix after 3 years?