/usr/lib/x86_64-linux-gnu/libpangomm-1.4.so is in libpangomm-1.4-dev 2.38.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpangomm-1.4.so.1.0.30
/usr/lib/x86_64-linux-gnu/libpangomm-1.4.so.1.0.30