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Question

Eu digitei o comando

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade

e obteve o seguinte erro

W: Failed to fetch http://old-releases.ubuntu.com/ubuntu/dists/precise/main/source/Sources  404  Not Found

e outras mensagens semelhantes

Anteriormente, eu havia digitado os seguintes comandos de uma resposta neste site Atualizando para uma versão não mais suportada

username-M:~$ sudo cp -v /etc/apt/sources.{list,backup}
[sudo] password for username: 
'/etc/apt/sources.list' -> '/etc/apt/sources.backup'

username:~$ sudo sed -i 's/us.archive/old-releases/' /etc/apt/sources.list

o arquivo sources.list problemático

# deb cdrom:[Ubuntu 12.04 _Precise Pangolin_ - Release i386 (20131017)]/ precise main restricted

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

## Major bug fix updates produced after the final release of the
## distribution.
deb http://old-releases.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-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://old-releases.ubuntu.com/ubuntu/ precise universe
deb-src http://old-releases.ubuntu.com/ubuntu/ precise universe
deb http://old-releases.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-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://old-releases.ubuntu.com/ubuntu/ precise multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ precise multiverse
deb http://old-releases.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-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://old-releases.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://old-releases.ubuntu.com/ubuntu/ precise-security main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-security main restricted
deb http://old-releases.ubuntu.com/ubuntu/ precise-security universe
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-security universe
deb http://old-releases.ubuntu.com/ubuntu/ precise-security multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ precise-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 precise 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 precise main
# deb-src http://extras.ubuntu.com/ubuntu precise main
deb http://old-releases.ubuntu.com/ubuntu/ precise-proposed restricted main multiverse universe

    

Answer 1

O problema é que você está tentando usar o processo para atualizar a partir de uma versão sem suporte, quando sua versão ainda é suportada.

Isso é mostrado pela sua linha de erro

W: Failed to fetch http://old-releases.ubuntu.com/ubuntu/dists/precise/main/source/Sources  404  Not Found

Ele tem o nome de lançamento 'preciso', relacionado a 12.04, uma versão ainda suportada. Os repositórios precisos ainda estarão disponíveis em us.archive.ubuntu.com e ainda não foram movidos para o servidor old-releases .

Você pode redefinir seu arquivo sources.list a partir do seu backup com o comando:

sudo cp /etc/apt/sources.backup /etc/apt/sources.list

Depois disso, seus comandos apt-get devem funcionar.

Editar:

Parece que o arquivo /etc/apt/sources.backup contém as mesmas linhas que o arquivo /etc/apt/sources.list , portanto seria prudente fazer outro backup desse arquivo sources.list e tentar corrigir a opção de us.archive.ubuntu.com to old-releases.ubuntu.com .

Faça um novo backup com:

sudo cp -a /etc/apt/sources.list /etc/apt/sources.secondbackup

E faça o contrário do comando anterior sed :

sudo sed -i 's/old-releases/us.archive/' /etc/apt/sources.list

Em seguida, para verificar se funcionou, basta atualizar o seu comando apt-get :

sudo apt-get update

    

Answer 2

Você deve redefinir seu repositório redefinindo o arquivo sources.list que estará em /etc/apt/sources.list

Visite link para gerar o novo arquivo sources.list de acordo com sua versão do Ubuntu

Faça backup de sources.list antes de fazer algo destrutivo, como um sed no local, substitua-o no futuro

e.g. sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup.