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在更新nvidia-docker   拉取的cuda-11.0  镜像中  的 容器中   ，执行apt update 命令  报出以下问题 ：

root@6f3e3db63505:/etc/apt# apt updateHit:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic InReleaseHit:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates InReleaseHit:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-backports InReleaseHit:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security InReleaseIgn:5 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  InReleaseGet:6 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  Release [697 B]Get:7 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  Release.gpg [836 B]Ign:8 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  PackagesIgn:8 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  PackagesIgn:8 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  PackagesErr:8 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64  Packages  404  Not Found [IP: 180.101.196.129 443]Fetched 1533 B in 18s (84 B/s)Reading package lists... DoneE: Failed to fetch https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu2004/x86_64/by-hash/SHA256/60afcf24526893b1713a7ce2d773cabe942d80dd637ba44327e34e890118a730  404  Not Found [IP: 180.101.196.129 443]E: Some index files failed to download. They have been ignored, or old ones used instead.

 执行以命令  

wget http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/7fa2af80.pubsudo apt-key add 7fa2af80.pub

 此处错误即可跳过

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