执行sudo apt-get update 报错 The following signatures couldn't be verified

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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

1. Hit http://cn.archive.ubuntu.com trusty/multiverse i386 Packages               
   
2. Hit http://cn.archive.ubuntu.com trusty/main Translation-en                    
   
3. Hit http://cn.archive.ubuntu.com trusty/multiverse Translation-en              
   
4. Hit http://cn.archive.ubuntu.com trusty/restricted Translation-en              
   
5. Hit http://cn.archive.ubuntu.com trusty/universe Translation-en               
   
6. Ign http://cn.archive.ubuntu.com trusty/main Translation-en_US                 
   
7. Ign http://cn.archive.ubuntu.com trusty/multiverse Translation-en_US           
   
8. Ign http://cn.archive.ubuntu.com trusty/restricted Translation-en_US           
   
9. Ign http://cn.archive.ubuntu.com trusty/universe Translation-en_US            
   
10. Fetched 72 B in 18s (3 B/s)                                                   
    
11. Reading package lists... Done
    
12. 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
    

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解决方案：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192

1. xincun@xincun:~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
   
2. 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
   
3. gpg: requesting key 3E5C1192 from hkp server keyserver.ubuntu.com
   
4. gpg: key 3E5C1192: public key "Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com>" imported
   
5. gpg: Total number processed: 1
   
6. gpg: imported: 1

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