安装软件包时找不到 404

Question

我有一个到目前为止一直运行良好的脚本，突然我收到以下消息：

Get:81 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 python-software-properties all 0.96.20.7 [20.7 kB]
Get:82 http://archive.ubuntu.com/ubuntu xenial/main amd64 python3-pycurl amd64 7.43.0-1ubuntu1 [42.3 kB]
Get:83 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 python3-software-properties all 0.96.20.7 [20.3 kB]
Get:84 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 software-properties-common all 0.96.20.7 [9452 B]
Get:85 http://archive.ubuntu.com/ubuntu xenial/main amd64 xz-utils amd64 5.1.1alpha+20120614-2ubuntu2 [78.8 kB]
Err:86 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 unattended-upgrades all 0.90ubuntu0.7
  404  Not Found [IP: 91.189.88.161 80]
Fetched 23.7 MB in 1s (14.8 MB/s)
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/libpython3.5-minimal_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/python3.5-minimal_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/libpython3.5-stdlib_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/python3.5_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/libi/libidn/libidn11_1.32-3ubuntu1.1_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/u/unattended-upgrades/unattended-upgrades_0.90ubuntu0.7_all.deb  404  Not Found [IP: 91.189.88.161 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
The command '/bin/sh -c apt-get -y install software-properties-common python-software-properties' returned a non-zero code: 100

似乎在运行时：

apt-get -y install software-properties-common python-software-properties

某些服务器已关闭。我怎样才能避免这种依赖性？这是持续集成服务器的一部分，我希望将来避免这些问题。

注意：我sudo apt update之前跑过.. 这实际上是 Dockerfile 的一部分：

FROM ubuntu:16.04
RUN apt-get update
RUN apt-get -y install software-properties-common python-software-properties
RUN apt-get -y install ca-certificates curl
RUN apt-get -y install build-essential git sudo

构建容器在第二行失败。

Answer 1

根据docker 最佳实践，我应该将更新和安装放在同一 RUN 行中。这样缓存将被正确更新。

在这些变化之后，事情正在起作用。