Hmm.. I did the following sequence:
- Uninstalled KStars, PHD2 and all Indi Drivers and Library
- Downloaded indi Sources from this website (Ver. 1.3.1)
- cd ed into libindi directory
- used the commands in the README to cmake libindi
- installed PHD2 and KStars bleeding from the repositories (via apt install)
--> both work now

but I am surely not an expert and moreover I cannot find any libindi.so.1 on my system anymore

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