Não consigo instalar MongoDB / Rocket.chat

### Repositórios padrão.
deb http://http.debian.net/debian/">http://http.debian.net/debian/ jessie main non-free contrib
#deb-src http://http.debian.net/debian/">http://http.debian.net/debian/ jessie main non-free contrib

### Atualizações de Segurança.
deb http://security.debian.org/">http://security.debian.org/ jessie/updates main contrib non-free
#deb-src http://security.debian.org/">http://security.debian.org/ jessie/updates main contrib non-free

### Volatile (softwares atualizados com frequência, Clamav, etc)
deb http://http.debian.net/debian/">http://http.debian.net/debian/ jessie-updates main contrib non-free
#deb-src http://http.debian.net/debian/">http://http.debian.net/debian/ jessie-updates main contrib non-free

### Backports (no momento)
deb http://http.debian.net/debian/">http://http.debian.net/debian/ jessie-backports main contrib non-free
#deb-src http://http.debian.net/debian/">http://http.debian.net/debian/ jessie-backports main contrib non-free

Ign file: apt-build InRelease
Ign file: apt-build Release.gpg
Hit http://security.debian.org jessie/updates InRelease
Ign http://repo.mongodb.org stretch/mongodb-org/4.0 InRelease
Obter:1 file: apt-build Release [107 B]
Ign http://http.debian.net jessie InRelease
Hit http://repo.mongodb.org stretch/mongodb-org/4.0 Release.gpg
Ign file: apt-build/main Translation-pt_BR
Ign file: apt-build/main Translation-pt
Ign file: apt-build/main Translation-en
Hit http://http.debian.net jessie-updates InRelease
Hit http://repo.mongodb.org stretch/mongodb-org/4.0 Release
Ign http://http.debian.net jessie-backports InRelease
Obter:2 http://security.debian.org jessie/updates/main amd64 Packages [763 kB]
Hit http://http.debian.net jessie Release.gpg
Ign http://http.debian.net jessie-backports Release.gpg
Obter:3 http://repo.mongodb.org stretch/mongodb-org/4.0/main amd64 Packages [12,4 kB]
Obter:4 http://http.debian.net jessie-updates/main amd64 Packages [20 B]
Obter:5 http://security.debian.org jessie/updates/contrib amd64 Packages [2.506 B]
Obter:6 http://http.debian.net jessie-updates/contrib amd64 Packages [20 B]
Ign http://repo.mongodb.org stretch/mongodb-org/4.0/main Translation-pt_BR
Ign http://repo.mongodb.org stretch/mongodb-org/4.0/main Translation-pt
Ign http://repo.mongodb.org stretch/mongodb-org/4.0/main Translation-en
Obter:7 http://http.debian.net jessie-updates/non-free amd64 Packages [20 B]
Obter:8 http://security.debian.org jessie/updates/non-free amd64 Packages [4.700 B]
Obter:9 http://http.debian.net jessie-updates/contrib Translation-en [14 B]
Obter:10 http://http.debian.net jessie-updates/main Translation-en [14 B]
Obter:11 http://security.debian.org jessie/updates/contrib Translation-en [1.211 B]
Obter:12 http://http.debian.net jessie-updates/non-free Translation-en [14 B]
Obter:13 http://security.debian.org jessie/updates/main Translation-en [391 kB]
Obter:14 http://security.debian.org jessie/updates/non-free Translation-en [11,8 kB]
Hit http://http.debian.net jessie Release
Ign http://http.debian.net jessie-backports Release
Obter:15 http://http.debian.net jessie/main amd64 Packages [6.818 kB]
Obter:16 http://http.debian.net jessie/non-free amd64 Packages [83,2 kB]
Obter:17 http://http.debian.net jessie/contrib amd64 Packages [49,8 kB]
Obter:18 http://http.debian.net jessie/contrib Translation-en [38,3 kB]
Obter:19 http://http.debian.net jessie/main Translation-pt_BR [803 kB]
Obter:20 http://http.debian.net jessie/main Translation-pt [413 kB]
Obter:21 http://http.debian.net jessie/main Translation-en [4.581 kB]
Obter:22 http://http.debian.net jessie/non-free Translation-en [72,0 kB]
Err http://http.debian.net jessie-backports/main amd64 Packages
404 Not Found
Err http://http.debian.net jessie-backports/contrib amd64 Packages
404 Not Found
Err http://http.debian.net jessie-backports/non-free amd64 Packages
404 Not Found
Ign http://http.debian.net jessie-backports/contrib Translation-pt_BR
Ign http://http.debian.net jessie-backports/contrib Translation-pt
Ign http://http.debian.net jessie-backports/contrib Translation-en
Ign http://http.debian.net jessie-backports/main Translation-pt_BR
Ign http://http.debian.net jessie-backports/main Translation-pt
Ign http://http.debian.net jessie-backports/main Translation-en
Ign http://http.debian.net jessie-backports/non-free Translation-pt_BR
Ign http://http.debian.net jessie-backports/non-free Translation-pt
Ign http://http.debian.net jessie-backports/non-free Translation-en
Obtidos 12,4 kB em 24s (500 B/s)
W: Falhou obter http://http.debian.net/debian/">http://http.debian.net/debian/dists/jessie-backports/main/binary-amd64/Packages 404 Not Found

W: Falhou obter http://http.debian.net/debian/">http://http.debian.net/debian/dists/jessie-backports/contrib/binary-amd64/Packages 404 Not Found

W: Falhou obter http://http.debian.net/debian/">http://http.debian.net/debian/dists/jessie-backports/non-free/binary-amd64/Packages 404 Not Found

E: Falhou o download de alguns ficheiros de índice. Foram ignorados ou os antigos foram usados em seu lugar.

A ler as listas de pacotes... Pronto
A construir árvore de dependências
A ler a informação de estado... Pronto
build-essential já está na versão mais recente.
build-essential está definido para ser instalado manualmente.
Alguns pacotes não puderam ser instalados. Isso pode significar que
você solicitou uma situação impossível ou se você está a usar a
distribuição unstable em que alguns pacotes pedidos ainda não foram
criados ou foram movidos do Incoming.
A seguinte informação pode ajudar a resolver a situação:

Os pacotes a seguir têm dependências não satisfeitas:
mongodb-org : Depende: mongodb-org-shell mas não vai ser instalado
Depende: mongodb-org-server mas não vai ser instalado
Depende: mongodb-org-mongos mas não vai ser instalado
Depende: mongodb-org-tools mas não vai ser instalado
E: Não foi possível corrigir problemas, você tem pacotes mantidos (hold) estragados.