Get:3 http://deb.debian.org jessie Release [77.3 kB] Get:4 http://deb.debian.org jessie-updates/main amd64 Packages [20 B] Get:5 http://deb.debian.org jessie/main amd64 Packages [9098 kB] Fetched 9193 kB in 19s (470 kB/s) W: Failed to fetch http://security.debian.org/dists/jessie/updates/main/binary-amd64/Packages 503 DNS error for hostname dists: Name or service not known. If dists refers to a configured cache repository, please check the corresponding configuration file.
E: Some index files failed to download. They have been ignored, or old ones used instead. The command '/bin/sh -c apt-get update' returned a non-zero code: 100 ERROR: Job failed: exit status 1