aptitude update
Get: 1 http://security.debian.org jessie/updates Release.gpg [836 B]
Get: 2 http://security.debian.org jessie/updates Release [77.8 kB]
Get: 3 http://security.debian.org jessie/updates/main Sources [14 B]
Get: 4 http://security.debian.org jessie/updates/main amd64 Packages [14 B]
Get: 5 http://security.debian.org jessie/updates/main Translation-en [14 B]
Get: 6 http://ftp.us.debian.org jessie Release.gpg [1,571 B]
Ign http://ftp.us.debian.org jessie-updates Release.gpg
Get: 7 http://ftp.us.debian.org jessie Release [147 kB]
Ign http://ftp.us.debian.org jessie-updates Release
Get: 8 http://ftp.us.debian.org jessie/main Sources [6,557 kB]
Get: 9 http://ftp.us.debian.org jessie/main amd64 Packages [6,243 kB]
Get: 10 http://ftp.us.debian.org jessie/main Translation-en [4,155 kB]
Err http://ftp.us.debian.org jessie-updates/main Sources
  404  Not Found [IP: 128.61.240.89 80]
Err http://ftp.us.debian.org jessie-updates/main amd64 Packages
  404  Not Found [IP: 128.61.240.89 80]
Ign http://ftp.us.debian.org jessie-updates/main Translation-en_US
Ign http://ftp.us.debian.org jessie-updates/main Translation-en
Fetched 17.2 MB in 33s (517 kB/s)
W: Failed to fetch http://ftp.us.debian.org/debian/dists/jessie-updates/main/source/Sources: 404  Not Found [IP: 128.61.240.89 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages: 404  Not Found [IP: 128.61.240.89 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
E: Couldn't rebuild package cache

Current status: 938 updates [+938], 36692 new [+36692].