/usr/share/doc/libpangomm-1.4-dbg/changelog.Debian.gz is in libpangomm-1.4-dbg 2.38.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libpangomm-1.4-dbg/../libpangomm-1.4-1v5/changelog.Debian.gz