Ubuntu 15.10 - apt-get update - erro

[andergenext]

Esta ocorrendo um erro que impede a conclusao do processo:

-- Incio --
W: Falhou ao buscar http://archive.canonical.com/dists/wily/InRelease  Incapaz de encontrar a entrada 'p/source/Sources' esperada no ficheiro Release (entrada errada em sources.list ou ficheiro malformado)

W: Falhou ao buscar http://extras.ubuntu.com/ubuntu/dists/wily/main/source/Sources  404  Not Found [IP: 91.189.92.152 80]

W: Falhou ao buscar http://extras.ubuntu.com/ubuntu/dists/wily/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.152 80]

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

Atraves do comando apt-get autoclean ja' identifiquei algumas entradas duplicadas que foram corrigidas no arquivo /etc/apt/sources.list

Se alguem puder me ajudar agradeco.

anderson@Extensa-4620:~$ cat /etc/issue
Ubuntu 15.10 \n \l


anderson@Extensa-4620:~$ cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 15.10 _Wily Werewolf_ - Release i386 (20151021)]/ wily main restricted
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu wily main restricted
deb-src http://archive.ubuntu.com/ubuntu wily main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu wily-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu wily-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu wily universe
deb-src http://archive.ubuntu.com/ubuntu wily universe
deb http://archive.ubuntu.com/ubuntu wily-updates universe
deb-src http://archive.ubuntu.com/ubuntu wily-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu wily multiverse
deb-src http://archive.ubuntu.com/ubuntu wily multiverse
deb http://archive.ubuntu.com/ubuntu wily-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu wily-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu wily-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu wily-backports main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu wily-security main restricted
deb-src http://archive.ubuntu.com/ubuntu wily-security main restricted
deb http://archive.ubuntu.com/ubuntu wily-security universe
deb-src http://archive.ubuntu.com/ubuntu wily-security universe
deb http://archive.ubuntu.com/ubuntu wily-security multiverse
deb-src http://archive.ubuntu.com/ubuntu wily-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
deb-src http://archive.canonical.com/ubuntu wily partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu wily main
deb http://archive.canonical.com/ wily partner p artner
deb-src http://archive.canonical.com/ wily p artner
deb-src http://archive.canonical.com/ wily partner
deb-src http://archive.canonical.com/ wily partner
deb http://archive.ubuntu.com/ubuntu wily universe restricted multiverse main
deb-src http://extras.ubuntu.com/ubuntu wily main

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

## Major bug fix updates produced after the final release of the
## distribution.

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://br.archive.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu wily partner
# deb-src http://archive.canonical.com/ubuntu wily partner
anderson@Extensa-4620:~$

[irtigor]

deb http://extras.ubuntu.com/ubuntu wily main
deb http://archive.canonical.com/ wily partner p artner
deb-src http://archive.canonical.com/ wily p artner
...
deb-src http://extras.ubuntu.com/ubuntu wily main

Esses quatro não existem. Também vi mais alguns duplicados. Seria mais fácil começar do zero, só com o que quer.

[isaelfm]

Você pode usar o Synaptic.
Configurações > Repositórios > Outros programas
Identificar e remover os que estão falhando, fiz aqui dessa forma e resolveu. Caso não tenha o Synaptic instalado, pode encontra-lo através da central de programas (não sei se vem instalado no ubuntu-unity por padrão).
Depois de um apt-get update para checar se está tudo ok.
T+