https://bugs.kde.org/show_bug.cgi?id=382628

            Bug ID: 382628
           Summary: G'Mic fails to start because could not find Qt
                    platform plugin "xcb" - Krita v3.2.0-beta.2
           Product: krita
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: G'Mic for Krita
          Assignee: krita-bugs-n...@kde.org
          Reporter: kxk-ocumoatbugs...@lugosys.com
  Target Milestone: ---

G'Mic won't start and no information or visible reaction is shown on Krita's
GUI when 'Start GMic-Qt' is selected in the Filter menu.

When launching Krita on the console, this error is logged exactly when the
'Start GMic-Qt' button is pressed:

stateChanged QProcess::ProcessState(Starting)
stateChanged QProcess::ProcessState(Running)
Plugin started true QProcess::ProcessState(Running)
gmic-qt: socket Key: "{5e393e6a-8442-4d77-ba98-1cf48f9c929f}"
This application failed to start because it could not find or load the Qt
platform plugin "xcb"
in "".

Reinstalling the application may fix this problem.
stateChanged QProcess::ProcessState(NotRunning)
pluginFinished 6 QProcess::ExitStatus(CrashExit)

----
My system: Kubuntu 16.04; Krita 3.2.0-beta.2 (running the appimage from
/opt/krita/); G'Mic v2.02
----

Steps to reproduce: 

1. Download the G'Mic plug-in for Krita in
http://gmic.eu/files/prerelease_linux/gmic_krita_qt_linux64.zip, and unzip the
files and "place it somewhere you can find it."
2. "Go to Settings → Configure Krita → G'Mic plugin and set G'MIC to the
filepath there; then restart Krita." (Quoted from Krita documentation).
3. Go to Krita's menu: Filter -> Start GMic-Qt, and when asked, enter the
location of the gmic_krita_qt file that was unzipped earlier. Alternatively, go
to Settings -> Configure Krita -> G'Mic-Qt Integration and enter (or browse to)
the gmic_krita_qt file path and click OK.
4. Restart Krita (don't know if it's necessary, but won't make a difference).
5. Open an image file, and select Filter -> 'Start GMic-Qt'.
At this point, nothing visible will happen in Krita's GUI. But if you have
launched Krita from the console, then you will see the aforementioned error
message.

Expected behaviour: G'Mic should launch when the 'Start GMic-Qt' button is
pressed.

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