This file is indexed.

/usr/lib/x86_64-linux-gnu/libgdkmm-3.0.so.1 is in libgtkmm-3.0-1 3.10.1-0ubuntu2.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libgdkmm-3.0.so.1.1.0