Hello and thank you very much
in fact I get
apt-file find libappindicator3.so.1
libappindicator3-1: /usr/lib/x86_64-linux-gnu/libappindicator3.so.1
libappindicator3-1: /usr/lib/x86_64-linux-gnu/libappindicator3.so.1.0.0
So I do not know what ist the reason for the error-message.
Any idea?
Regards