当我尝试运行该命令时，sudo apt-get update我得到以下信息：
Ign http://security.debian.org jessie/updates InRelease
Ign http://security.debian.org jessie/updates Release.gpg
Ign http://security.debian.org jessie/updates Release
Ign http://security.debian.org jessie/updates/main Sources/DiffIndex
Ign http://packages.dotdeb.org jessie InRelease
Ign http://httpredir.debian.org jessie InRelease
Ign http://security.debian.org jessie/updates/contrib Sources/DiffIndex
Ign http://httpredir.debian.org jessie-updates InRelease
Ign http://ftp.debian.org jessie InRelease
Hit http://debmon.org debmon-jessie InRelease
Ign http://security.debian.org jessie/updates/non-free Sources/DiffIndex
Ign http://httpredir.debian.org jessie Release.gpg
Ign http://ftp.debian.org jessie-updates InRelease
Ign http://packages.dotdeb.org jessie Release.gpg
Ign http://security.debian.org jessie/updates/main amd64 Packages/DiffIndex
Ign http://security.debian.org jessie/updates/contrib amd64 Packages/DiffIndex
Ign http://httpredir.debian.org jessie-updates Release.gpg
Ign http://packages.dotdeb.org jessie Release
Ign http://security.debian.org jessie/updates/non-free amd64 Packages/DiffIndex
Ign http://httpredir.debian.org jessie Release
Hit http://ftp.debian.org jessie Release.gpg
Ign http://ftp.debian.org jessie-updates Release.gpg
Ign http://httpredir.debian.org jessie-updates Release
Hit http://debmon.org debmon-jessie/main amd64 Packages
Ign http://packages.dotdeb.org jessie/all Sources/DiffIndex
Ign http://packages.dotdeb.org jessie/all amd64 Packages/DiffIndex
Hit http://ftp.debian.org jessie Release
Ign http://ftp.debian.org jessie-updates Release
Ign http://debmon.org debmon-jessie/main Translation-en_NZ
Ign http://debmon.org debmon-jessie/main Translation-en
Ign http://ftp.debian.org jessie-updates/main Sources/DiffIndex
Ign http://ftp.debian.org jessie-updates/contrib Sources/DiffIndex
Ign http://ftp.debian.org jessie-updates/non-free Sources/DiffIndex
Get:1 http://ftp.debian.org jessie-updates/main amd64 Packages/DiffIndex [6,916 B]
Ign http://ftp.debian.org jessie-updates/contrib amd64 Packages/DiffIndex
Get:2 http://ftp.debian.org jessie-updates/non-free amd64 Packages/DiffIndex [736 B]
Ign http://security.debian.org jessie/updates/contrib Translation-en_NZ
Ign http://security.debian.org jessie/updates/contrib Translation-en
Ign http://security.debian.org jessie/updates/main Translation-en_NZ
Ign http://packages.dotdeb.org jessie/all Translation-en_NZ
Ign http://security.debian.org jessie/updates/main Translation-en
Ign http://security.debian.org jessie/updates/non-free Translation-en_NZ
Hit http://ftp.debian.org jessie/main Sources
Ign http://packages.dotdeb.org jessie/all Translation-en
Ign http://security.debian.org jessie/updates/non-free Translation-en
Hit http://ftp.debian.org jessie/contrib Sources
Err http://packages.dotdeb.org jessie/all Sources
503 OUT OF DISK SPACE
Err http://security.debian.org jessie/updates/main Sources
404 Not Found
Hit http://ftp.debian.org jessie/non-free Sources
Err http://security.debian.org jessie/updates/contrib Sources
404 Not Found
Hit http://ftp.debian.org jessie/main amd64 Packages
Hit http://ftp.debian.org jessie/contrib amd64 Packages
Err http://security.debian.org jessie/updates/non-free Sources
404 Not Found
Err http://packages.dotdeb.org jessie/all amd64 Packages
503 OUT OF DISK SPACE
Hit http://ftp.debian.org jessie/non-free amd64 Packages
Err http://security.debian.org jessie/updates/main amd64 Packages
404 Not Found
Hit http://ftp.debian.org jessie/contrib Translation-en
Err http://security.debian.org jessie/updates/contrib amd64 Packages
404 Not Found
Hit http://ftp.debian.org jessie/main Translation-en
Err http://security.debian.org jessie/updates/non-free amd64 Packages
404 Not Found
Hit http://ftp.debian.org jessie/non-free Translation-en
Ign http://ftp.debian.org jessie-updates/contrib Translation-en_NZ
Ign http://ftp.debian.org jessie-updates/contrib Translation-en
Ign http://ftp.debian.org jessie-updates/main Translation-en_NZ
Ign http://ftp.debian.org jessie-updates/main Translation-en
Ign http://ftp.debian.org jessie-updates/non-free Translation-en_NZ
Ign http://ftp.debian.org jessie-updates/non-free Translation-en
Err http://ftp.debian.org jessie-updates/main Sources
404 Not Found
Err http://ftp.debian.org jessie-updates/contrib Sources
404 Not Found
Err http://ftp.debian.org jessie-updates/non-free Sources
404 Not Found
Err http://ftp.debian.org jessie-updates/contrib amd64 Packages
404 Not Found
Err http://httpredir.debian.org jessie/main amd64 Packages
404 Not Found
Err http://httpredir.debian.org jessie/contrib amd64 Packages
404 Not Found
Err http://httpredir.debian.org jessie/non-free amd64 Packages
404 Not Found
Ign http://httpredir.debian.org jessie/contrib Translation-en_NZ
Ign http://httpredir.debian.org jessie/contrib Translation-en
Ign http://httpredir.debian.org jessie/main Translation-en_NZ
Ign http://httpredir.debian.org jessie/main Translation-en
Ign http://httpredir.debian.org jessie/non-free Translation-en_NZ
Ign http://httpredir.debian.org jessie/non-free Translation-en
Err http://httpredir.debian.org jessie-updates/main amd64 Packages
404 Not Found
Err http://httpredir.debian.org jessie-updates/contrib amd64 Packages
404 Not Found
Err http://httpredir.debian.org jessie-updates/non-free amd64 Packages
404 Not Found
Ign http://httpredir.debian.org jessie-updates/contrib Translation-en_NZ
Ign http://httpredir.debian.org jessie-updates/contrib Translation-en
Ign http://httpredir.debian.org jessie-updates/main Translation-en_NZ
Ign http://httpredir.debian.org jessie-updates/main Translation-en
Ign http://httpredir.debian.org jessie-updates/non-free Translation-en_NZ
Ign http://httpredir.debian.org jessie-updates/non-free Translation-en
Fetched 7,652 B in 58s (130 B/s)
W: Failed to fetch http://security.debian.org/dists/jessie/updates/main/source/Sources 404 Not Found
W: Failed to fetch http://security.debian.org/dists/jessie/updates/contrib/source/Sources 404 Not Found
W: Failed to fetch http://security.debian.org/dists/jessie/updates/non-free/source/Sources 404 Not Found
W: Failed to fetch http://security.debian.org/dists/jessie/updates/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://security.debian.org/dists/jessie/updates/contrib/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://security.debian.org/dists/jessie/updates/non-free/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/contrib/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/non-free/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/contrib/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/non-free/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://packages.dotdeb.org/dists/jessie/all/source/Sources 503 OUT OF DISK SPACE
W: Failed to fetch http://packages.dotdeb.org/dists/jessie/all/binary-amd64/Packages 503 OUT OF DISK SPACE
W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/main/source/Sources 404 Not Found
W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/contrib/source/Sources 404 Not Found
W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/non-free/source/Sources 404 Not Found
W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/contrib/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
另外，我不小心删除了 php5 软件包，现在无法安装它们，我认为无法安装丢失的软件包的问题是由于无法成功运行 apt-get 引起的。我正在使用 Linux Debian Jessie v8
请帮忙，谢谢：:)
答案1
我设法解决了这个问题，下面我发布了如何解决问题的分步指南：
- 通过从 /etc/apt/sources.list.d/{thirdpartyfilename.list} 中注释掉系统使用的任何第三方存储库，确保禁用它们
- 确保文件 /etc/apt/sources.list 具有正确的有效源列表，如果您不确定如何生成有效源列表，您可以通过此网站使用生成器https://debgen.simplylinux.ch/只需输入“位置”、您正在使用的软件的版本（例如 Debian Jessie），并确保勾选 Debian 分支和 Debian 更新的所有框
- 通常，源列表可能不是最新的，因此将源位置更改为不同国家/地区的服务器实际上可能会使其正常工作。例如ftp.debian.org可能会产生损坏的结果，因此将其更改为http://ftp.us.debian.org可能会成功
- 修复源列表 404 未找到错误意味着现在您应该能够通过运行命令来修补系统sudo apt-get 更新因此，只需运行命令即可安装任何丢失或损坏的软件包（未满足的依赖项）sudo apt-get -f 安装