/usr/share/doc/libtag1-dev/changelog.Debian.gz is in libtag1-dev 1.7-1ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtag1-dev/../libtag1-vanilla/changelog.Debian.gz
/usr/share/doc/libtag1-dev/../libtag1-vanilla/changelog.Debian.gz