/usr/lib/x86_64-linux-gnu/libappindicator.so.1 is in libappindicator1 12.10.1+18.04.20180322.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libappindicator.so.1.0.0