/usr/lib/x86_64-linux-gnu/libnetcdf_c++.so.4 is in libnetcdf-c++4 4.2-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnetcdf_c++.so.4.2.0
/usr/lib/x86_64-linux-gnu/libnetcdf_c++.so.4.2.0