我的 Ubuntu 20 PC 出现问题。到目前为止，我经常使用 Docker，但是最近我无法再构建任何 docker 镜像。
问题是当 Dockerfile 具有通常的 RUN 命令时
RUN apt-get update && apt-get remove -y x264 libx264-dev
RUN apt-get update && apt-get upgrade -y && apt-get install -y sudo clang-format wget apt-utils
好吧，RUN apt-get update 每次都失败
Err:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Temporary failure resolving 'security.ubuntu.com'
Err:2 http://archive.ubuntu.com/ubuntu xenial InRelease
Temporary failure resolving 'archive.ubuntu.com'
Err:3 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64 InRelease
Could not resolve host: developer.download.nvidia.com
Err:4 http://archive.ubuntu.com/ubuntu xenial-updates InRelease
Temporary failure resolving 'archive.ubuntu.com'
Err:5 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
Temporary failure resolving 'archive.ubuntu.com'
Reading package lists...
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Failed to fetch https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/InRelease Could not resolve host: developer.download.nvidia.com
W: Some index files failed to download. They have been ignored, or old ones used instead.
这里会发生什么？
我记得有一次我遇到了类似的问题，重新启动后修复了它，但这次没有。