Getting the widget working on Kubuntu 22.04LTS

The widget does not work in KDE Framework 5.92 when you add a "System Monitor" widget due to a bug in the framework itself (see issue #89). Unfortunately version 5.92 is the version that is installed by Kubuntu 22.04LTS.

To fix it, you can either remove the system monitor widgets OR you can upgrade Kubuntu to KDE Plasma v5.25 from the official Backports-Extra repository.