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docker build時のapt-get updateでGPG errorが出る場合の対処

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今までビルドがうまくいっていたDockerfileで久々にdocker buildを行なうとなぜかエラーが出る場合がありますよね。今回はapt get update でGPG Errorが出た場合の対処方法を解説します(と言っても一瞬で完了)

まずDockerfileは前半部分の例を一部切り取って下記に掲載します。

FROM nvidia/cuda:11.2.0-cudnn8-devel-ubuntu18.04
LABEL Hogehoge <hogehoge@hogehoge.com>
ENV API_ROOT /home
ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get clean
RUN apt-get update
RUN apt-get install -y  --fix-missing \
    build-essential \
    wget \
    bzip2 \
    git \
    gcc \
    g++ \
    cmake \
    pkg-config \
    checkinstall \
    libssl-dev \
    libreadline-gplv2-dev \

過去にビルドしたときはうまくいっていたのに今回はなぜかapt-get updateでこのようなエラーがでます。

W: GPG error: https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64  InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC

このようなときはBase imageの最新版をpullしなおせばエラーが解決します。

$ docker pull nvidia/cuda:11.2.0-cudnn8-devel-ubuntu18.04

過去にdocker pullしていたBase imageの中に適切なpublic keyがないためこのようにして最新版のBase imageに更新する必要があります。

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