在 Ubuntu 16.04 中更新我的软件包列表时如何修复错误？

Question

当我尝试更新我的Ubuntu 16.04时出现此错误。我已经尝试了一些解决方案，但到目前为止没有任何效果。

错误：

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.

在从软件和更新部分取消检查一些不需要的包/存储库后，我设法摆脱了一些错误，但仍然存在一些错误：

 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.

应用下面提供的解决方案（由 Raphael 提供）后，大多数错误都得到了解决。除了这些错误：

 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

您正在使用Xenial但sources.list包含Precise. 为了纠正这一点，

• 备份您当前的sources.list：

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

• 创建一个新的source.list：

  sudo nano /etc/apt/sources.list
  

• 将以下内容复制并粘贴到其中：

  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 
  

• 然后，在键盘上按以下命令：

  Ctrl+X然后Y和最后Enter。

• 最后，尝试更新您的来源：

  sudo apt-get update
  

编辑：-ppa错误就是它所说的。那ppa没有Xenial. 要删除ppas，请在AskUbuntu 上按照此答案进行操作。