/usr/share/doc/libtrilinos-muelu-dev/changelog.Debian.gz is in libtrilinos-muelu-dev 12.4.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtrilinos-muelu-dev/../libtrilinos-teuchos12/changelog.Debian.gz