[转]ubuntu 下由于没有公钥，下列签名无法进行验证：解决方法

W: GPG签名验证错误： http://linux.dropbox.com karmic Release: 由于没有公钥，下列签名无法进行验证： NO_PUBKEY FC918B335044912E

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5044912E

若缺少其他公钥，则将命令中两处5044912E改为NO_PUBKEY FC918B335044912E中最后8位即可！

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