树莓派软件源更新提示 GPG公匙不存在

树莓派在更改软件源之后

运行

sudo apt-get update 更新软件源 之后

在读取包列表之后的安全验证的时候提示

Reading package lists... Done
W: GPG error: http://mirrors.ustc.edu.cn wheezy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B92D010 NO_PUBKEY 6FB2A1C665FFB764

解决方法

 $ gpg --keyserver keyserver.ubuntu.com --recv 7638D0442B92D010 ;gpg --export --armor 7638D0442B92D010 | sudo apt-key add -

gpg: requesting key 2B90D010 from hkp server keyserver.ubuntu.com
gpg: key 2B90D010: public key "Debian Archive Automatic Signing Key (8/jessie) " imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK

将三个公匙都添加进去