执行sudo apt-get update 报错 The following signatures couldn't be verified
问题：执行sudo apt-get update 报错
W: GPG error: http://extras.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
Hit http://cn.archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://cn.archive.ubuntu.com trusty/main Translation-en
Hit http://cn.archive.ubuntu.com trusty/multiverse Translation-en
Hit http://cn.archive.ubuntu.com trusty/restricted Translation-en
Hit http://cn.archive.ubuntu.com trusty/universe Translation-en
Ign http://cn.archive.ubuntu.com trusty/main Translation-en_US
Ign http://cn.archive.ubuntu.com trusty/multiverse Translation-en_US
Ign http://cn.archive.ubuntu.com trusty/restricted Translation-en_US
Ign http://cn.archive.ubuntu.com trusty/universe Translation-en_US
Fetched 72 B in 18s (3 B/s)
Reading package lists... Done
W: GPG error: http://extras.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
解决方案：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
xincun@xincun:~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.wMEQb3GlOq --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/openjdk-r-ppa.gpg --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
gpg: requesting key 3E5C1192 from hkp server keyserver.ubuntu.com
gpg: key 3E5C1192: public key "Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com>" imported
gpg: Total number processed: 1
gpg: imported: 1
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