运行时apt-get出现以下错误：-
W: GPG error: https://dl.bintray.com Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 99E82A75642AC823
W: Failed to fetch http://ppa.launchpad.net/picaso/octave/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/picaso/octave/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/samrog131/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/samrog131/ppa/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
我尝试了许多解决方案，但每一个都失败了。我现在无法sudo apt-get update在他们的脚本中安装任何软件:( 我已经尝试过系统更新，尝试联系密钥服务器（它总是返回超时）
执行apt-get-update 后，我总是收到以下错误消息：
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/ubuntu-audio-dev/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.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://dl.google.com/linux/chrome/deb stable InRelease' doesn't support architecture 'i386'
E: Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have …我打过电话sudo apt-get update，我得到了这样的东西
Err http://ppa.launchpad.net trusty/main i386 软件包 404 未找到
Err http://ppa.launchpad.net trusty/main i386 软件包 404 未找到
W：无法获取http：//ppa.launchpad.net/marlin-devs/marlin-daily/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found W：无法获取http：//ppa.launchpad.net/tiheum/equinox/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found E: 部分索引文件下载失败。它们已被忽略，或使用旧的代替。
在终端中输入 sudo apt-get update 后，出现以下错误：
Reading package lists... Done
W: The repository 'http://dl.bintray.com/aluxian/deb stable 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://dl.bintray.com/aluxian/deb/dists/stable/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
可能的重复：
如何使用 PPA 修复 404 错误？
我无法删除桌面右上角的红色三角形。当我输入时，
sudo apt-get update && sudo apt-get upgrade
我收到以下错误消息：
W: Failed to fetch http://ppa.launchpad.net/michael-gruz/canon/ubuntu/dists/precise/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/michael-gruz/canon/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
如何解决我的问题？
可能重复：
如何安装软件或从不受支持的旧版本升级？
运行更新时，我收到以下错误：
：无法获取http://gb.archive.ubuntu.com/ubuntu/dists/karmic-backports/main/source/Sources 404 Not Found [IP: 91.189.92.201 80] ，W：无法获取http:// gb.archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/source/Sources 404 Not Found [IP: 91.189.92.201 80] ,
E:部分索引文件下载失败。它们已被忽略，或使用旧的代替。
有更多相同类型的线条。我该如何解决？
在尝试更新我的 Ubuntu 16.04 系统时，我收到以下错误：
E: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-arm64/Packages 404 Not Found [IP: 141.30.62.24 80]
E: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-arm64/Packages 404 Not Found [IP: 141.30.62.24 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-arm64/Packages 404 Not Found [IP: 2001:67c:1360:8001::17 80]
E: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-arm64/Packages 404 Not Found [IP: 141.30.62.24 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
我尝试了此处建议的解决方案：16.04 升级：无法获取空文件不能是有效档案
但他们都没有为我工作。我遇到这个问题已经有一段时间了。我的架构是
amd64
外国拱门是
i386
arm64
我不能简单地删除 ARM 架构，因为我正在开发的 NVidia SDK 需要它。
任何帮助，将不胜感激！
在哪里可以找到失败apt-get update命令返回的错误代码？您能否向我指出调用返回的错误消息的代码或规范apt-get update failure？谢谢。
如果您能回答第一个问题，请继续忽略此问题的其余部分。如果您可以添加其他信息，即可获得奖励积分。
解决这些问题的建议解决方案是什么？
目前，我有三个我经常遇到的错误代码，我想知道是否还有更多我应该注意的。
以下是我所知道的错误的解决方法：
解决方案：通过运行以下命令将新的 gpg 公钥添加到我的可信链中：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <insert pub_key_here>
解决办法：重新添加密钥
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com <insert key here>
解决方案： ？
解决方案：站点不可用。要么等到站点返回，要么从sources.list 中删除存储库。
解决方案： ？
还有多少其他错误代码会apt-get update阻止用户更新其软件？是否有文档可以识别类似的问题？
我了解当我将第三方的密钥添加到我的可信链时隐式信任第三方时所涉及的风险。我正在寻找由失败生成的已知错误apt-get update以及允许我继续更新我的软件包的解决方案。
每当我使用 sudo apt-get update 时，都会显示此错误：
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://ppa.launchpad.net trusty Release
Ign http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty Release
Ign http://ppa.launchpad.net trusty/main amd64 Packages/DiffIndex
Ign http://ppa.launchpad.net trusty/main i386 Packages/DiffIndex
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Err http://ppa.launchpad.net trusty/main Sources
403 Forbidden
Ign http://ppa.launchpad.net trusty/main Translation-en_US
Ign …software-center updates update-manager package-management apt
我正在运行 Ubuntu 18.04 LTS，但无法从新的 PPA 安装。每次我尝试更新包列表时，它都会给我一个 404 错误。
curtice@linuxloverpc:~$ sudo apt update
[sudo] password for curtice:
Hit:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:4 http://ppa.launchpad.net/bartbes/love-stable/ubuntu bionic InRelease
Ign:5 http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu bionic InRelease
Hit:6 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu bionic InRelease
Hit:7 http://ppa.launchpad.net/papirus/papirus/ubuntu bionic InRelease
Err:8 http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu bionic Release
404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, …