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@sieder
Created January 8, 2019 11:46
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The following signatures couldn't be verified because the public key is not available: NO_PUBKEY [duplicate]
Solution : sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 23E7166788B63E1E
adduser user_name
usermod -aG sudo user_name
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