O.K. I´m writing to myself
found out that my sudo apt-get dist-upgrade wasn´t completed, there were 83 packages hold back.
after sudo apt-get --with-new-pkgs upgrade at least my logging to thingspeak is working again. Hope that the ifthen rules will work
when I test this evening. Also the 24 history is working again.
I also was able ot install the sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7E148E3C correct after these issues.
Just if someone else has the same problem......
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