/usr/share/doc/libmumps-scotch-dev/changelog.Debian.gz is in libmumps-scotch-dev 4.10.0.dfsg-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmumps-scotch-dev/../libmumps-4.10.0/changelog.Debian.gz