help can't login into kde/plasma which has worked before

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Hi,

I am running Fedora 23 with Gnome and the Plasma environment. Mostly I use Gnome but when I wanted to log in with plasma it failed. Both with gdm and kdm the plasma session just does not start. the screen flases black and I am back in gdm/kdm. I have already tried

a) deleting .cache
b) using a diffrent user
c) reinstalling kde with sudo dnf remove|install @kde-desktop-environment

UPDATE: I found a way to debug the start of kde. First shut down X-Server ($ init 3) and then execute

$startx /usr/bin/startkde

to see whats going on. Alternatively you can have a look into the Xorg log:

more /var/log/Xorg.*.log

By doing that I figured that the xcb module could not be found wich I fixed thanks to this post: https://joscor.com/blog/fedora-24-fix...

How Kde sort of starts but shows the error message:

All shell packages missing. This is an installtion issue, please contact your distribution

to solve that I tried:

sudo dnf install qt5*

with no effect.

It feels like Fedora missed to execute post installation skripts. For Example after removing and reinstalling kde the /usr/share/xsessions/plasma.desktop does not get rewritten.

Can you plese help me to be able to use plasma again?

Thanks!

Hongimelone