/usr/share/doc/libsprng2-doc/changelog.Debian.gz is in libsprng2-doc 2.0a-8ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsprng2-doc/../libsprng2/changelog.Debian.gz
/usr/share/doc/libsprng2-doc/../libsprng2/changelog.Debian.gz