e.g. <literal>APT::FTPArchive::Release::Origin</literal>. The supported fields
are <literal>Origin</literal>, <literal>Label</literal>, <literal>Suite</literal>,
<literal>Version</literal>, <literal>Codename</literal>, <literal>Date</literal>,
e.g. <literal>APT::FTPArchive::Release::Origin</literal>. The supported fields
are <literal>Origin</literal>, <literal>Label</literal>, <literal>Suite</literal>,
<literal>Version</literal>, <literal>Codename</literal>, <literal>Date</literal>,