Hi! After running a dist-upgrade (from stable to testing) KDE stopped working, all I get (after login in with lightdm) are the modals you can see in the attachments [1]. I do not think it is an X issue, because I can login using lightdm (and MATE is working fine).
I suspect this is because I had KDE installed before running the upgrade. The things I tried so far are:
- Runing "apt-get remove kdelibs-bin kdelibs5-data" . Then "apt-get autoremove". I did it to remove every KDE related package, after that, I ran "aptitude purge '~c' " to clean all config files. And finally "apt-get install kde-standard" to get KDE again.
- Removed .cache, .config and .kde folders. Also removed .lock files in .config folder, as I saw somewhere.
- Looked for some log files, but I could not find anything (I don't even know where to look really )

Right now I do not know what to do, I will appreciate if any of you had something similar and solved it. This is almost a fresh debian install so I don't mind breaking things, but I would like to get KDE working.
Thank you!

[1]
http://postimg.org/image/saoln9aj7/
http://postimg.org/image/eia6rmjrn/
http://postimg.org/image/aajzwm7pv/