Hi everyone,
I am using mainly budgie desktop, but yesterday I installed Plasma-desktop using the following command :
sudo eopkg it -c desktop.kde
After installation is finished, I updated and rebooted my system, and logged on the Plasma (Wayland) session. At this point, when I launch Discover, nothing happened.
I will try tomorrow the command you suggested and get back to you
plasma-discover --backends packagekit-backend,flatpak-backend,fwupd-backend,kns-backend
Nevertheless, I noticed recently the same problem on budgie desktop with playonlinux, virtualbox and pinta. I had to install the flatpak version of pinta to use it.