I am using Kde in Qubes 4.1 ,too . Sometimes… Sometimes i3…
And it is working. The problem that the module or group ist not found can be fixed
if u run first
sudo-qubes-dom0-update @kde-desktop-qubes
and then sudo dnf install plasma-workspace
If u like to have Dolphin, too u need to install sudo dnf install dolphin manually, too.
Everything running in Dom0.
And then u can install sddm in dom0. sudo-qubes-dom0-update sddm and can
sudo systemctl disable lightdm and sudo systemctl enable sddm ,use the default kde display manager. For me that has better performance then Lightdm and I prefer it. But I like to switch to the display manager ly as soon I know the compiling. But that is off topic.
A few shortcuts are not working and u have to confgure ur own, but the is the only thing I noticed.
Hope that helps
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