ubuntu 报错：“The following signatures couldn't be verified because the public key is not available”

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报错：GPG error: https://apt.2ndquadrant.com trusty-2ndquadrant InRelease，The following signatures couldn't be verified because the public key is not available

解决：

sudo apt-get update 2>&1 |
sed -ne 's?^.*NO_PUBKEY ??p' |
xargs -r -- sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys