我使用该add-apt-repository命令添加了许多 PPA 。有没有一种简单的方法可以删除这些 PPA？我已经检查/etc/apt/sources.list了适当的 deb 行，但它们不在那里。
这是在服务器系统上，所以命令行解决方案会很棒！
请让我知道如何在 Ubuntu 11.04 中删除某些存储库。更新时出现以下错误。
sudo apt-get update
Err http://ppa.launchpad.net natty/main Sources
404 Not Found
Err http://ppa.launchpad.net natty/main i386 Packages
404 Not Found
......
E: Some index files failed to download. They have been ignored, or old ones used instead.
更新时，我收到以下错误消息：
W: The repository 'http://ppa.launchpad.net/mc3man/trusty-media/ubuntu xenial Release' does not have a Release file.
在这里，我找到了关于此错误的另一个声明：如何在使用 PPA 或更新我的软件包列表时修复 404 错误？
这建议删除某些 PPA；而且，我不确定我是否应该这样做，因为这可能意味着无法获得我需要的更新。
这是我应该做的吗？
嗨，在根执行命令时 -
apt-get install alien
我收到以下错误（找不到页面）
你能修复/帮助吗
错误 http://us.archive.ubuntu.com/ubuntu/precision-updates/main libc-bin i386 2.15-0ubuntu10.6 404 未找到 [IP: 91.189.91.13 80] 错误 http://security.ubuntu.com/ubuntu/precision-security/main libc-bin i386 2.15-0ubuntu10.6 404 未找到 [IP: 91.189.91.14 80]
我在尝试更新我的包裹列表时遇到的错误。
W: GPG error: http://download.opensuse.org ./ Release: The following signatures were invalid: KEYEXPIRED 1436387333
W: Failed to fetch http://ppa.launchpad.net/samrog131/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
我正在使用 Ubuntu 20.04.3 LTS。我已经遇到错误 2 天了，即由于以下错误，我无法在系统上更新或升级或执行软件包安装：
Hit:1 http://packages.microsoft.com/repos/code stable InRelease
Hit:2 http://archive.canonical.com/ubuntu focal InRelease
Hit:3 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease
Ign:5 http://old-releases.ubuntu.com/ubuntu focal InRelease
Ign:6 http://old-releases.ubuntu.com/ubuntu focal-updates InRelease
Hit:7 http://ppa.launchpad.net/kicad/kicad-5.1-releases/ubuntu focal InRelease
Hit:8 https://deb.opera.com/opera-stable stable InRelease
Hit:9 https://packages.microsoft.com/repos/vscode stable InRelease
Ign:10 http://old-releases.ubuntu.com/ubuntu focal-backports InRelease
Ign:11 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Ign:12 http://old-releases.ubuntu.com/ubuntu focal-security InRelease
Err:14 http://old-releases.ubuntu.com/ubuntu focal Release
404 Not Found [IP: 91.189.88.247 80]
Err:15 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Err:16 http://old-releases.ubuntu.com/ubuntu focal-updates Release
404 Not …每次我尝试更新（使用sudo apt-get update）我的 Ubuntu 时，我都会遇到这个问题：
W: The repository 'cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1) 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 'ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous …W: The repository 'http://ppa.launchpad.net/gnome-terminator/ppa/ubuntu yakkety 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/gnome-terminator/ppa/ubuntu/dists/yakkety/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
在推出之前，我订购了一台装有 Windows 8 的新电脑进行测试。它随 Ubuntu 12.04 一起出现。而不是将其发回，我决定先检查一下，因为我认为该系统可能比 MS 选项好得多。但是，尽我所能，我无法设置 PPA。我正在尝试安装 Pinta-Paint，但找不到要复制到软件中心的行。请有人指出我正确的方向。
W：无法获取 http://dl.google.com/linux/deb/dists/raring/Release.gpg 解决“dl.google.com:http”时发生了一些坏事（-11 - 系统错误） W：无法获取 http://packages.medibuntu.org/dists/raring/Release.gpg 解决“packages.medibuntu.org:http”时发生了一些坏事（-11 - 系统错误） W：无法获取 http://repository.spotify.com/dists/raring/non-free/binary-amd64/Packages 404 Not Found W：无法获取 http://repository.spotify.com/dists/raring/non-free/binary-i386/Packages 404 Not Found W：无法获取 http://dl.google.com/linux/deb/dists/raring/non-free/binary-amd64/Packages 404 Not Found [IP: 173.194.46.69 80] W：无法获取 http://dl.google.com/linux/deb/dists/raring/main/binary-amd64/Packages 404 Not Found [IP: 173.194.46.69 80] W：无法获取 http://dl.google.com/linux/deb/dists/raring/non-free/binary-i386/Packages 404 Not Found [IP: 173.194.46.69 80] W：无法获取 http://dl.google.com/linux/deb/dists/raring/main/binary-i386/Packages 404 Not Found [IP: 173.194.46.69 80] W：无法获取 http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found W：无法获取 http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found W：无法获取 http://ppa.launchpad.net/amith/ubuntutools/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found W：无法获取 http://ppa.launchpad.net/amith/ubuntutools/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found E: 部分索引文件下载失败。他们已被忽视，或旧`
我怎样才能解决这个问题？每次我运行 sudo apt-get update 时都会发生这种情况？