Thanks so much for your help.
I tried
- commenting out *-testing repos and then update: result: the same dependency error.
- commenting out kde-unstable as well: result: the same dependency error
Then I did some more research on [1] and it seemed legit. So I did that procedure.
That did indeed resolved the
error: GPGME error: No data
I’m now stuck at “just” the dependency error. I would rate that as progress ;-).
Could it be that this dependency error needs to be reported over at bugs.kde.org?
(I think I saw that on my Plasma 5 setup the update from
appstream-qt
to
appstream-qt5
went without a problem today.)