I tried to start it from terminal. This is what I get: $ kolourpaint Empty filename passed to function Cannot mix incompatible Qt library (version 0x50903) with this library (version 0x50a00) KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = kolourpaint path = /usr/bin pid = 13068 KCrash: Arguments: /usr/bin/kolourpaint KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit sock_file=/run/user/1000/kdeinit5__0 Killed I'm using a fresh install of KDE neon. I think this happened after I tried opening an image with kolourpaint directly from dolphin. I right-clicked the image > open with > kolourpaint. kolourpaint version 17.12.2
It looks like not all packages that depend on Qt have been recompiled...
I rebooted after that and now sddm is black https://bugs.kde.org/show_bug.cgi?id=390986 maybe the problem is that I installed kio-extras?
The issue is that there was a Qt update in neon. The update unfortunately was published before all depending packages were rebuilt.390919 *** This bug has been marked as a duplicate of bug 390919 ***