Install kubuntu-notification-helper-dbg by entering the following commands in the terminal:
sudo apt update sudo apt install kubuntu-notification-helper-dbg
Description:
Kubuntu Notification Helper debugging symbols
This package contains debugging symbols for Kubuntu Notification Helper. When Kubuntu Notification Helper crashes, in most cases this package is needed to get a backtrace that is useful for developers. If you have experienced a Kubuntu Notification Helper crash without this package installed, please install it, try to reproduce the problem and fill a bug report with a new backtrace attached.
Homepage: https://www.kubuntu.org
Version: 18.04ubuntu1
Section: universe/debug