1.GPG error: https://download.docker.com/linux/ubuntu focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
通常是缺少Docker的GPG密钥引起的。重新输入”添加Docker的GPG密钥”命令即可。
2.E: The repository ‘https://download.docker.com/linux/ubuntu focal Release’ does not have a Release file.
可能是Docker APT源配置不正确。确保已正确设置APT源,重新配置试下。
3.Failed to fetch https://download.docker.com/linux/ubuntu/dists/focal/InRelease Could not connect to download.docker.com:443 (13.35.250.16), connection timed out