CPU and network usage is not available !!! Reproducible: Always
looks like a packaging issue, kf5 ksysguard does have a working cpu and network monitor
anyone can reproduce on kubuntu packages?
I have the same problem on Fedora. kde plasma version: 5.10.5 kde frameworks version: 5.42.0 qt version: 5.9.2 kernel version: 4.14.14-200.fc26.x86_64
This looks like a specif problem of your setup, since it is working for others. Please ask at your distribution forums or https://forum.kde.org/ for help.
Deleting ~/.local/share/ksysguard fixed the problem for me.