I've had an off and on (intermittent) problem with loading Plasma-Discover. It may work for a week, then stops loading, then works for a day or two. It's been broken for about a week and a half. My research has lead me to a flatpak/snap-backends issue. I was able to get Discover up and running by changing the program launch command (KDE Menu Editor) from
to
. After first run, KDE Menu Editor will move the --backends part to command line arguments or you can add it yourself initially. The secret is to move snap to anywhere but right after packagekit in --backends.
Program: plasma-discover
Programs: plasma-discover --backends snap,packagekit,flatpak,fwupd,kns %F
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