What is the content of /etc/dbus-scripts.d/dbus-scripts-settings ?

The script runs as root, so if kagu needs to run as a user, you need to write some script that will use su or sudo to run kagu.

The way I debug is always use a script, instead of using the program directly, and I include a line such as:

date >> /tmp/my.log

so I can at least tell if the script ran when it was supposed to.