Ubuntu – black desktop in KDE on primary monitor

kdekubuntumultiple-monitors

I have Kubuntu 20.04 LTS version. I have two monitors connected to my PC – primary one via HDMI and secondary via DisplayPort. Both have the same resolution.
After login into KDE I have the 'task panel' and the 'application launcher' on the correct (primary) monitor. But sometimes I dont have any 'desktop' – just black screen (when I minize all windows) on the primary monitor. I have correct desktop wallpaper on the secondary monitor – but of course, without any widgets since they are placed on the primary one.
I don't know exact steps to reproduce, because it seems this is happening randomly – sometimes I have the desktop wallpaper and sometimes i don't. In all cases I have wallpaper on secondary monitor and I have the 'main panel' and 'application launcer' visible on the primary one (but not the other widgets, icons and wallpaper)
This happens on different activities too – for some I have the desktop layout as Desktop and for other I have it as Folder View
Any idea what can couse this and/or how to fix it?

Thanks

Best Answer

I have to use the following command from terminal:

kquitapp5 plasmashell && kstart5 plasmashell &

but yes I am also looking for solution to make it start automatically as in single display.

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