/usr/share/doc/libtrilinos-phalanx12/changelog.Debian.gz is in libtrilinos-phalanx12 12.12.1-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtrilinos-phalanx12/../libtrilinos-teuchos12/changelog.Debian.gz