更新 apt 时出错

更新 apt 时出错

sudo apt update 的结果

E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/main/binary-arm64/Packages  404  Not Found [IP: 185.125.190.39 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/main/binary-arm64/Packages  404  Not Found [IP: 91.189.91.39 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-updates/main/binary-arm64/Packages  404  Not Found [IP: 185.125.190.39 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

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