I'm trying to get thumbnails in dolphin, so far I've installed
```
pkgs.dolphin
pkgs.kdeApplications.dolphin-plugins
pkgs.ffmpegthumbs
pkgs.kdeApplications.kdegraphics-thumbnailers
pkgs.kdeApplications.kio-extras
```
But I just get
```
kf5.kservice.services: KServiceTypeTrader: serviceType "ThumbCreator" not found
```