Hi all, Vladimir is right, same issue here. Indeed, It is weird to me not so many people is currently reporting on it, but it is affecting a lot of programs. Something happens when upgrading to version 0.6.x (I agree at this point)
plasma-desktop is also unable to start and panic (black screen).If you update-alternative glx fall back to mesa, the desktop runs just fine (of course, without the nvidia drivers) I though it was solved by bug 799948 (ssdm panic too), but again, it is not. At least you can "adduser sddm video" and make ssdm-greater works as a workaround, but plasma-desktop panics still panics after you try to log on. It is very easy to check it. Just install a fresh installation of KDE and nvidia drivers and you will see a beautiful black screen. Let me know if you need additional information but it is quite easy to reproduce Regards