KDE not working after dist-upgrade
 

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 :P )

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/

If there is no important data stored on this machine, then you should reinstall.

You are aware that "testing" is well software that needs to be tested
it might not work , hence the NEED to test it

@Keruskerfuerst: If I don't find any other solution I will. Thanks!
@John VV: I am aware

I've heard of problems with others when doing the same thing. The problem is if you have an Nvidia GPU and you are trying to update the kernel. I've heard that you should uninstall proprietary Nvidia drivers, if you have them, before doing dist-upgrade.

Hmmm, Did you try reinstalling KDE?

I just did a fresh install, everything is working now. Thank you for your time :)