GPG error: https://download.docker.com/linux/ubuntu bionic InRelease: The following signatures could
解决报错GPG error: https://download.docker.com/linux/ubuntu bionic InRelease:The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
问题：
sudo apt update报错 ：
GPG error: https://download.docker.com/linux/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
一般遇到NO_PUBKEY只需要添加这个key就行：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7EA0A9C3F273FCD8但是对于这个docker的key却不行。
解决办法
First, add key to /usr/share/keyrings/docker-archive-keyring.gpg by command:
sudo curl -fsSL "https://download.docker.com/linux/ubuntu/gpg" | sudo gpg --dearmor --yes -o /usr/share/keyrings/docker-archive-keyring.gpg
PS For some the part gpgp --dearmor was useful.
Second, update permissions for it:
sudo chmod a+r /usr/share/keyrings/docker-archive-keyring.gpgThen，
sudo apt update参考：
Docker: How to solve the public key error in ubuntu while installing docker - Stack Overflow
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