当我运行时sudo apt-get update，出现以下错误：
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/main/binary-armhf/Packages 404 Not Found [IP: 91.189.91.15 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
我试过/etc/apt/sources.list.d/查看是否可以删除该目录中的任何内容，但所有内容都在
nodesource.list
nodesource.list.save
在我的sources.list文件中，我有：
deb http://ports.ubuntu.com/ubuntu-ports/ trusty main
deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty main
deb http://ports.ubuntu.com/ubuntu-ports/ trusty-updates main
deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-updates main
deb http://ports.ubuntu.com/ubuntu-ports/ trusty-security main
deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-security main
deb http://archive.ubuntu.com/ubuntu trusty main
# deb-src http://archive.ubuntu.com/ubuntu trusty main
任何人都可以推荐一种修复此错误的方法吗？