/usr/share/doc/libbabl-0.1-0-dbg/changelog.Debian.gz is in libbabl-0.1-0-dbg 0.1.10-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libbabl-0.1-0-dbg/../libbabl-0.1-0/changelog.Debian.gz