最近，我在 apt-get 更新时开始遇到 404 错误，而据我所知，并没有发生特别有趣的变化。
dh@ubuntu:/etc/apt$ sudo apt-get update
Ign file: InRelease
Ign file: InRelease
Ign file: InRelease
Get:1 file: Release.gpg [198 B]
Get:2 file: Release.gpg [181 B]
Get:3 file: Release.gpg [181 B]
Get:4 file: Release [196 B]
Get:5 file: Release [191 B]
Get:6 file: Release [195 B]
Ign file: Translation-en_US
Ign file: Translation-en
Ign file: Translation-en_US
Ign file: Translation-en
Ign file: Translation-en_US
Ign file: Translation-en
Ign http://us.archive.ubuntu.com trusty InRelease
Hit http://us.archive.ubuntu.com trusty-updates InRelease
Ign http://extras.ubuntu.com trusty InRelease
Hit http://security.ubuntu.com trusty-security InRelease
Ign http://archive.canonical.com trusty InRelease
Hit http://us.archive.ubuntu.com trusty-backports InRelease
Hit http://us.archive.ubuntu.com trusty Release.gpg
Hit http://extras.ubuntu.com trusty Release.gpg
Hit http://archive.canonical.com trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/main amd64 Packages
Hit http://us.archive.ubuntu.com trusty-updates/main amd64 Packages
Hit http://extras.ubuntu.com trusty Release
Hit http://archive.canonical.com trusty Release
Hit http://us.archive.ubuntu.com trusty-updates/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages
Hit http://us.archive.ubuntu.com trusty-updates/universe amd64 Packages
Hit http://extras.ubuntu.com trusty/main Sources
Hit http://security.ubuntu.com trusty-security/universe amd64 Packages
Hit http://archive.canonical.com trusty/partner Sources
Hit http://us.archive.ubuntu.com trusty-updates/multiverse amd64 Packages
Hit http://extras.ubuntu.com trusty/main amd64 Packages
Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages
Hit http://archive.canonical.com trusty/partner amd64 Packages
Hit http://archive.canonical.com trusty/partner armhf Packages
Hit http://extras.ubuntu.com trusty/main i386 Packages
Hit http://archive.canonical.com trusty/partner i386 Packages
Hit http://us.archive.ubuntu.com trusty-updates/main i386 Packages
Hit http://us.archive.ubuntu.com trusty-updates/restricted i386 Packages
Hit http://us.archive.ubuntu.com trusty-updates/universe i386 Packages
Hit http://us.archive.ubuntu.com trusty-updates/multiverse i386 Packages
Hit http://us.archive.ubuntu.com trusty-updates/main Translation-en
Hit http://us.archive.ubuntu.com trusty-updates/multiverse Translation-en
Hit http://security.ubuntu.com trusty-security/main i386 Packages
Ign http://archive.canonical.com trusty/partner Translation-en
Hit http://us.archive.ubuntu.com trusty-updates/restricted Translation-en
Hit http://security.ubuntu.com trusty-security/restricted i386 Packages
Hit http://us.archive.ubuntu.com trusty-updates/universe Translation-en
Hit http://us.archive.ubuntu.com trusty-backports/main amd64 Packages
Hit http://security.ubuntu.com trusty-security/universe i386 Packages
Hit http://us.archive.ubuntu.com trusty-backports/restricted amd64 Packages
Hit http://us.archive.ubuntu.com trusty-backports/universe amd64 Packages
Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages
Err http://extras.ubuntu.com trusty/main armhf Packages
404 Not Found [IP: 91.189.92.152 80]
Hit http://us.archive.ubuntu.com trusty-backports/multiverse amd64 Packages
Hit http://security.ubuntu.com trusty-security/main Translation-en
Hit http://security.ubuntu.com trusty-security/multiverse Translation-en
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Hit http://us.archive.ubuntu.com trusty-backports/main i386 Packages
Hit http://us.archive.ubuntu.com trusty-backports/restricted i386 Packages
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Hit http://us.archive.ubuntu.com trusty-backports/universe i386 Packages
Hit http://us.archive.ubuntu.com trusty-backports/multiverse i386 Packages
Ign http://extras.ubuntu.com trusty/main Translation-en_US
Hit http://us.archive.ubuntu.com trusty-backports/main Translation-en
Ign http://extras.ubuntu.com trusty/main Translation-en
Hit http://us.archive.ubuntu.com trusty-backports/multiverse Translation-en
Hit http://us.archive.ubuntu.com trusty-backports/restricted Translation-en
Hit http://us.archive.ubuntu.com trusty-backports/universe Translation-en
Hit http://us.archive.ubuntu.com trusty Release
Err http://security.ubuntu.com trusty-security/main armhf Packages
404 Not Found [IP: 91.189.92.200 80]
Err http://security.ubuntu.com trusty-security/restricted armhf Packages
404 Not Found [IP: 91.189.92.200 80]
Err http://security.ubuntu.com trusty-security/universe armhf Packages
404 Not Found [IP: 91.189.92.200 80]
Err http://security.ubuntu.com trusty-security/multiverse armhf Packages
404 Not Found [IP: 91.189.92.200 80]
Hit http://us.archive.ubuntu.com trusty/main Sources
Hit http://us.archive.ubuntu.com trusty/restricted Sources
Hit http://us.archive.ubuntu.com trusty/universe Sources
Hit http://us.archive.ubuntu.com trusty/multiverse Sources
Hit http://us.archive.ubuntu.com trusty/main amd64 Packages
Hit http://us.archive.ubuntu.com trusty/universe amd64 Packages
Hit http://us.archive.ubuntu.com trusty/restricted amd64 Packages
Hit http://us.archive.ubuntu.com trusty/multiverse amd64 Packages
Hit http://us.archive.ubuntu.com trusty/main i386 Packages
Hit http://us.archive.ubuntu.com trusty/universe i386 Packages
Hit http://us.archive.ubuntu.com trusty/restricted i386 Packages
Hit http://us.archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://us.archive.ubuntu.com trusty/main Translation-en
Hit http://us.archive.ubuntu.com trusty/multiverse Translation-en
Hit http://us.archive.ubuntu.com trusty/restricted Translation-en
Hit http://us.archive.ubuntu.com trusty/universe Translation-en
Err http://us.archive.ubuntu.com trusty-updates/main armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-updates/restricted armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-updates/universe armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-updates/multiverse armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-backports/main armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-backports/restricted armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-backports/universe armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty-backports/multiverse armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty/main armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty/universe armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty/restricted armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Err http://us.archive.ubuntu.com trusty/multiverse armhf Packages
404 Not Found [IP: 91.189.91.24 80]
Ign http://us.archive.ubuntu.com trusty/main Translation-en_US
Ign http://us.archive.ubuntu.com trusty/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com trusty/restricted Translation-en_US
Ign http://us.archive.ubuntu.com trusty/universe Translation-en_US
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/main/binary-armhf/Packages 404 Not Found [IP: 91.189.92.200 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/restricted/binary-armhf/Packages 404 Not Found [IP: 91.189.92.200 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/universe/binary-armhf/Packages 404 Not Found [IP: 91.189.92.200 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/multiverse/binary-armhf/Packages 404 Not Found [IP: 91.189.92.200 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/trusty/main/binary-armhf/Packages 404 Not Found [IP: 91.189.92.152 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/main/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/restricted/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/multiverse/binary-armhf/Packages 404 Not Found [IP: 91.189.91.24 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
我的 /etc/apt/sources.list 包含：
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
# deb http://linux.dropbox.com/ubuntu trusty main
# deb-src http://linux.dropbox.com/ubuntu trusty main
deb http://us.archive.ubuntu.com/ubuntu/ trusty main universe restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
对我来说，考虑到我在 x86 上，更新看起来好像正在尝试打击 ARM 源，这有点奇怪：
dh@ubuntu:/etc/apt$ arch
x86_64
这可能与我刚刚从这台 Ubuntu 机器上交叉编译并在 Jetson TK1（ARMHF）上安装了 JetPack 有关？这只是一个大胆的猜测。
确实，丢失的远程文件确实丢失了，但是，呃，我哪里出错了，我该如何恢复……？
谢谢您的任何建议！
担
答案1
您的系统已将 armhf 架构作为外部架构添加到其中。
dpkg --remove-architecture armhf
应该可以解决问题。之后执行“apt-get update”，问题应该就消失了。