试图获取archive.ubuntu.com/ubuntu/pool/main中不可用的版本

Question

我一直无法从gcc和相关的主要Ubuntu存储库中获取错误。我运行了sudo apt update --fix-missing和sudo apt upgrade，错误保持不变。

查看http://archive.ubuntu.com/ubuntu/pool/main/g/gcc-9/，我可以验证：( a)服务器正在正确地响应；( b)那里有需要获取的文档，而不是apt正在寻找的版本。

为什么要寻找不同的版本呢？如何重置或重建apt用于版本号的列表？

Err:6 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libc-dev-bin amd64 2.31-0ubuntu9.2
  404  Not Found [IP: 185.125.190.39 80]
Ign:7 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 linux-libc-dev amd64 5.4.0-100.113
Err:8 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libc6-dev amd64 2.31-0ubuntu9.2
  404  Not Found [IP: 185.125.190.39 80]
Err:9 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libc6-dbg amd64 2.31-0ubuntu9.2
  404  Not Found [IP: 185.125.190.39 80]
Err:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 gcc-9-base amd64 9.3.0-17ubuntu1~20.04
  404  Not Found [IP: 185.125.190.39 80]
Err:2 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 cpp-9 amd64 9.3.0-17ubuntu1~20.04
  404  Not Found [IP: 185.125.190.39 80]
Err:3 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libasan5 amd64 9.3.0-17ubuntu1~20.04
  404  Not Found [IP: 185.125.190.39 80]
Err:4 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libgcc-9-dev amd64 9.3.0-17ubuntu1~20.04
  404  Not Found [IP: 185.125.190.39 80]
Err:5 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 gcc-9 amd64 9.3.0-17ubuntu1~20.04
  404  Not Found [IP: 185.125.190.39 80]
Err:7 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 linux-libc-dev amd64 5.4.0-100.113
  404  Not Found [IP: 185.125.190.39 80]
Unable to correct missing packages.
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/g/gcc-9/gcc-9-base_9.3.0-17ubuntu1~20.04_amd64.deb  404  Not Found [IP: 185.125.190.39 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/g/gcc-9/cpp-9_9.3.0-17ubuntu1~20.04_amd64.deb  404  Not Found [IP: 185.125.190.39 80]

Answer 1

1. 尝试删除/var/lib/apt/lists/的内容--可能包含一些破损/过时的包列表。在sudo apt update之后应该和新的一样好。
2. 有关发布文件“无效”的消息可能是由于时钟倾斜造成的。确保你的时钟设置正确。
3. 当您收到有关冲突包的消息时，请尝试删除它们，然后重新安装。