9.5.12-0ubuntu0.16.04
) is not available, but a newer one is (9.5.14-0ubuntu0.16.04
). We redirected you there.
/usr/share/postgresql/9.5/timezonesets/ is in postgresql-9.5 9.5.14-0ubuntu0.16.04.
This file is owned by root:root, with mode 0o755.