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@kaizen_nagoya(Dr. Kiyoshi Ogawa)

今日のDocker error: the following signatures couldn’t be verified because the public key is not available

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Fix apt-get update “the following signatures couldn’t be verified because the public key is not available”

bash
#  apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5
E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation
# apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation
#
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