>> I did not compile anything from source > Then why you have binaries in /usr/local?
Hm, seems that indeed I did try out someone else's non standard attempt of connecting a recent iOS device to my machine many months ago. My bad. It didn't work as expected and I left an instance of libimobiledevice6 in /usr/local/lib. Same thing is true with a program I did compile and use last year. It was was dependent on libssl, worked well but only until some new ssl version broke it and I stopped using it. Lesson learned. Thanks to all once more for helping me sort this out. Regards, Andreas