knshandler will fail when specified dependency is to big with. It will fail only when there is more than one dependency specified in metadata desktop X-KPackage-Dependencies=kns://colorschemes.knsrc/api.kde-look.org/1167638,kns://icons.knsrc/api.kde-look.org/1166289 QProcess: Destroyed while process ("/usr/lib/x86_64-linux-gnu/libexec/kf5/kpackagehandlers/knshandler") is still running Installs fine when using that command /usr/lib/x86_64-linux-gnu/libexec/kf5/kpackagehandlers/knshandler kns://icons.knsrc/api.kde-look.org/1166289