rebuilderd: unexpected error while rebuilding package: Failed to download original package from "http://deb.debian.org/debian/pool/main/f/ferret-vis/ferret-vis_7.6.0-9_armel.deb": HTTP status client error (404 Not Found) for url (http://deb.debian.org/debian/pool/main/f/ferret-vis/ferret-vis_7.6.0-9_armel.deb)