After upgrading to plasma 5.7 with kde neon user edition 5.7 I lost my Task Manager completely. The only thing I can see on my panel is an icon. If I press, I get: Error loading QML file: file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/main.qml:26:1: module "org.kde.taskmanager" is not installed Reproducible: Always
You don't seem to have a matching version of plasma-workspace installed, which includes libtaskmanager, which installs the org.kde.taskmanager Qt Quick plugin. This is a packaging issue. Reassigning to Neon.
Thanks a lot! I've just solved the problem by "sudo apt install --reinstall plasma-workspace". Previously I got the line saying "The following packages have been kept back: plasma-workspace". Sorry for disturbing! I'm a KDE-noob:)
you always should do dist-upgrades or use plasma discover.