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apt-get update报错the public key is not available
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ubuntu 更新升级命令
# 取得远端更新服务器的套件档案清单sudo apt-get update # 更新套件sudo apt-get -y dist-upgrade # 清除更新时所下载到本地的更新（安装）档案sudo apt-get clean # 自动清除更新后用不到的旧版本档案sudo apt-get autoremove # 若不定时移除旧核心档案，容易造成/boot空间不足，严重时将无法开机ubuntu apt 源列表文件位置
/etc/apt/sources.list
ubuntu主机添加或者修改源以后，使用
apt-get update时，可能会报该错如下：
# apt-get update Hit:1 http://mirrors.cloud.aliyuncs.com/ubuntu xenial InReleaseHit:2 http://mirrors.cloud.aliyuncs.com/ubuntu xenial-updates InRelease Hit:3 http://mirrors.cloud.aliyuncs.com/ubuntu xenial-security InRelease Err:4 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEBReading package lists... DoneW: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEBW: Failed to fetch https://mirrors.aliyun.com/kubernetes/apt/dists/kubernetes-xenial/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEBW: Some index files failed to download. They have been ignored, or old ones used instead 这是由于etc/apt/sources.list提供的源没有提供公钥，所以更新软件源失败
# 导入报错中提示缺少的公钥# apt-key adv --recv-keys --keyserver keyserver.ubuntu.com XXXXXXXXXRecommend
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