apt source:
deb http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse报错
E: Failed to fetch http://mirrors.163.com/ubuntu/dists/xenial/main/binary-arm64/Packages 404 Not Found [IP: 59.111.0.251 80] E: Failed to fetch http://mirrors.163.com/ubuntu/dists/xenial-security/multiverse/binary-arm64/Packages 404 Not Found [IP: 59.111.0.251 80] E: Failed to fetch http://mirrors.163.com/ubuntu/dists/xenial-updates/multiverse/binary-arm64/Packages 404 Not Found [IP: 59.111.0.251 80] E: Failed to fetch http://mirrors.163.com/ubuntu/dists/xenial-proposed/main/binary-arm64/Packages 404 Not Found [IP: 59.111.0.251 80] E: Failed to fetch http://mirrors.163.com/ubuntu/dists/xenial-backports/universe/binary-arm64/Packages 404 Not Found [IP: 59.111.0.251 80] E: Some index files failed to download. They have been ignored, or old ones used instead.调整
https://askubuntu.com/questions/104695/how-do-i-change-mirrors-in-ubuntu-server-from-regional-to-main
deb http://us.archive.ubuntu.com/ubuntu/ lucid main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ lucid main restricted报错
E: The repository 'http://us.archive.ubuntu.com/ubuntu lucid Release' does not have a Release file
最终解决
https://askubuntu.com/questions/431375/list-of-available-ubuntu-packages-for-arm-processors
deb http://ports.ubuntu.com/ubuntu-ports/ bionic main restricted universe multiverse\n\ deb http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse\n\ deb http://ports.ubuntu.com/ubuntu-ports/ bionic-updates main restricted universe multiverse\n\ deb http://ports.ubuntu.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse\n\ deb http://ports.ubuntu.com/ubuntu-ports/ bionic-backports main restricted universe multiverse\n\ deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic main restricted universe multiverse\n\ deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse\n\ deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic-updates main restricted universe multiverse\n\ deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse\n\ deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic-backports main restricted universe multiverse\n
