Ubuntu 找不到ARM64 的源

Ubuntu 安装了NVIDIA的驱动还有DriveWokrs之后，好像把系统添加了arm64的架构，因此，在源更新的时候，也会更新arm64相关的源，但是问题在于，用sudo apt-get update的时候，找不到源，会报错

Err:28 http://us.archive.ubuntu.com/ubuntu xenial/main arm64 Packages

Err:54 http://us.archive.ubuntu.com/ubuntu xenial-updates/main arm64 Packages

Err:78 http://us.archive.ubuntu.com/ubuntu xenial-backports/main arm64 Packages

E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-arm64/Packages

E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-arm64/Packages

E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-arm64/Packages

每次更新都很慢，找了好久，才找到相关的答案，答案很简单，就是再source.list 里面每个deb 链接后面增加：[arch=amd64,i386]

比如：把

deb http://archive.ubuntu.com/ubuntu xenial universe

改成

deb [arch=amd64,i386] http://archive.ubuntu.com/ubuntu xenial universe

参考：https://devtalk.nvidia.com/default/topic/1004601/jetson-tx2/after-installing-jetpack3-0-host-computer-is-not-able-to-apt-get-update/