新装了个云服务器，系统更新时遇到了这么个问题：
W: GPG error: http://mirrors.cloud.aliyuncs.com/debian stretch-proposed-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY 0E98404D386FA1D9
W: The repository 'http://mirrors.cloud.aliyuncs.com/debian stretch-proposed-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.cloud.aliyuncs.com/debian stretch-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY 0E98404D386FA1D9
W: The repository 'http://mirrors.cloud.aliyuncs.com/debian stretch-backports InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
The following signatures couldn’t be verified because the public key is not available.
提示仓库没有签名，缺PUBKEY。
解决办法：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <PUB_KEY>
把报错中提示的KEY 的值替换填进去即可，如遇到多个则重复多次。
如果运行上面的命令报以下错误：
gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory
gpg: connecting dirmngr at '/run/user/0/gnupg/d.55u7f7akgdikezu64enn1c1n/S.dirmngr' failed: No such file or directory
gpg: keyserver receive failed: No dirmngr
则需要先安装dirmngr:
sudo apt-get install software-properties-common dirmngr
安装后则可正常更新。
完。
新装了个云服务器，系统更新时遇到了这么个问题：
W: GPG error: http://mirrors.cloud.aliyuncs.com/debian stretch-proposed-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY 0E98404D386FA1D9
W: The repository 'http://mirrors.cloud.aliyuncs.com/debian stretch-proposed-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.cloud.aliyuncs.com/debian stretch-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY 0E98404D386FA1D9
W: The repository 'http://mirrors.cloud.aliyuncs.com/debian stretch-backports InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
The following signatures couldn’t be verified because the public key is not available.
提示仓库没有签名，缺PUBKEY。
解决办法：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <PUB_KEY>
把报错中提示的KEY 的值替换填进去即可，如遇到多个则重复多次。
如果运行上面的命令报以下错误：
gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory
gpg: connecting dirmngr at '/run/user/0/gnupg/d.55u7f7akgdikezu64enn1c1n/S.dirmngr' failed: No such file or directory
gpg: keyserver receive failed: No dirmngr
则需要先安装dirmngr:
sudo apt-get install software-properties-common dirmngr
安装后则可正常更新。
完。