Falha ao baixar repositório

Para variar sou mais um usuário novato! Instalei a versão 14.04 do Ubuntu e não consigo atualizar o pacote de idioma dos meus apps. A minha internet tá blz e se alguém puder me dar uma luz tô precisando.
Segue abaixo o erro que apresenta no atualizador de programas:

W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic/main/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic/universe/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic/main/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic/universe/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-backports/main/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-backports/universe/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-backports/main/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-backports/universe/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-security/universe/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-security/main/source/Sources 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-security/main/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-security/universe/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-proposed/universe/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, W:Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/utopic-proposed/main/binary-i386/Packages 404 Not Found [IP: 200.236.31.4 80]
, E:Some index files failed to download. They have been ignored, or old ones used instead.

desativa o ipv6 no network manager

14.10 está sem suporte
Faça bkp
Instale 14.04.3-lts

o dele é 14.04

Perae, você usa 14.04 com repositórios da 14.10? 14.10 é a Utopic, e estes repositórios não estão disponiveis.

-abra terminal e poste saida do comando: [b]lsb_release -a[/b

-eu estou testando o 15.10
ubuntu@Infoway:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily