Como corrigir o erro, enquanto atualizo minha lista de pacotes no Ubuntu 16.04? [duplicado]

Question

Eu recebo este erro quando tento atualizar meu Ubuntu 16.04 . Eu já tentei algumas soluções, mas nada funcionou até agora.

Erro:

W: http://archive.canonical.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dists/precise-security/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: GPG error: http://extras.ubuntu.com/ubuntu precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
W: The repository 'http://extras.ubuntu.com/ubuntu precise Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: The repository 'http://ppa.launchpad.net/upubuntu-com/network/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/network/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

Após desmarcar alguns pacotes / repositórios indesejados da seção de software e atualização, consegui me livrar de alguns dos erros, mas ainda existem poucos erros:

 The repository 'http://ppa.launchpad.net/upubuntu-com/network/ubuntu xenial Release' does not have a Release file.
 N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
 N: See apt-secure(8) manpage for repository creation and user configuration details.
 W: http://archive.canonical.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
 E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/network/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
 E: Some index files failed to download. They have been ignored, or old ones used instead.

Depois de aplicar a solução fornecida abaixo (por Raphael), a maioria dos erros foi resolvida. Exceto esses erros:

 W: The repository 'http://ppa.launchpad.net/upubuntu-com/network/ubuntu xenial Release' does not have a Release file.
 N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
 N: See apt-secure(8) manpage for repository creation and user configuration details.
 E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/network/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
 E: Some index files failed to download. They have been ignored, or old ones used instead.

    

Answer 1

Você está usando Xenial , mas seu sources.list contém links para Precise . Para corrigir isso,

• Faça o backup do seu atual sources.list :

  sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak
  

• Crie um novo source.list :

  sudo nano /etc/apt/sources.list
  

• Copie e cole o seguinte:

  deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
  deb http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 
  deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
  deb http://us.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse 
  deb http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 
  

• Depois, no teclado, pressione o seguinte:

  Ctrl + X então Y e finalmente Enter .

• Por fim, tente atualizar suas fontes:

  sudo apt-get update
  

EDITAR : - O erro ppa é o que diz. Esse ppa não tem um arquivo de lançamento para Xenial . Para remover ppas , siga esta resposta em AskUbuntu .