The version you requested (9.3.22-0ubuntu0.14.04) is not available, but a newer one is (9.3.24-0ubuntu0.14.04). We redirected you there.
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/usr/share/doc/postgresql-9.3/changelog.Debian.gz is in postgresql-9.3 9.3.24-0ubuntu0.14.04.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/share/doc/postgresql-9.3/../libpq5/changelog.Debian.gz