The following signatures couldn't be verified because the public key is not available
2016-11-21 14:43
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安装第三方源：
W: GPG error: http://ppa.launchpad.net precise
Release: The following signatures couldn't be verified because the public key is not available:
NO_PUBKEY 2EA8F35793D8809A
解决方法：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 2EA8F35793D8809A
W: GPG error: http://ppa.launchpad.net precise
Release: The following signatures couldn't be verified because the public key is not available:
NO_PUBKEY 2EA8F35793D8809A
解决方法：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 2EA8F35793D8809A
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