9.6.7-0+deb9u1
) is not available, but a newer one is (9.6.11-0+deb9u1
). We redirected you there.
/usr/share/doc/postgresql-9.6/README.Debian.gz is in postgresql-9.6 9.6.11-0+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/postgresql-9.6/../postgresql-common/README.Debian.gz