/usr/share/doc/libtag1-dev/changelog.Debian.gz is in libtag1-dev 1.9.1-2.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtag1-dev/../libtag1v5-vanilla/changelog.Debian.gz
/usr/share/doc/libtag1-dev/../libtag1v5-vanilla/changelog.Debian.gz