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使用 sudo apt-get update 时出现 404 错误及更多错误

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使用 sudo apt-get update 时出现 404 错误及更多错误

我对 Linux 还很陌生。

运行 Ubuntu 16.04。
执行时sudo apt-get update出现404错误，Failed to fetch ...还有许多其他问题。我不知道这是什么，也不知道如何修复。

它看起来是这样的：

Err:16 http://ppa.launchpad.net/tualatrix/ppa/ubuntu xenial/main amd64 Packages
  404  Not Found
Err:18 http://ppa.launchpad.net/tualatrix/ppa/ubuntu xenial/main i386 Packages
  404  Not Found
Err:25 http://ppa.launchpad.net/upubuntu-com/gtk3themes/ubuntu xenial/main amd64 Packages
  404  Not Found
Err:26 http://ppa.launchpad.net/upubuntu-com/gtk3themes/ubuntu xenial/main i386 Packages
  404  Not Found
Fetched 529 kB in 5s (95,5 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/tualatrix/ppa/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: The repository 'http://ppa.launchpad.net/upubuntu-com/gtk3themes/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: GPG error: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.04  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A7D1D38BEB6D886
W: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.04  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: There is no public key available for the following key IDs:
5A7D1D38BEB6D886  
E: Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/xenial/main/binary-i386/Packages  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/gtk3themes/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/gtk3themes/ubuntu/dists/xenial/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

答案1

这些 PPA 尚未更新至 16.04。您可以等待或通过 禁用它们Updates。

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