This file is indexed.

/usr/lib/x86_64-linux-gnu/libgtkmm-2.4.so is in libgtkmm-2.4-dev 1:2.24.2-1ubuntu1.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libgtkmm-2.4.so.1.1.0