[apt update docker 密钥问题]

问题输出

Get:26 http://mirrors.aliyun.com/ubuntu focal-backports/restricted amd64 DEP-11 Metadata [212 B]
Get:27 http://mirrors.aliyun.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [30.5 kB]
Get:28 http://mirrors.aliyun.com/ubuntu focal-backports/multiverse amd64 DEP-11 Metadata [212 B]
Reading package lists... Done
W: http://mirrors.aliyun.com/ubuntu/dists/focal/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: 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
E: The repository 'https://download.docker.com/linux/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://mirrors.aliyun.com/ubuntu/dists/focal-security/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://mirrors.aliyun.com/ubuntu/dists/focal-updates/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://mirrors.aliyun.com/ubuntu/dists/focal-proposed/InRelease: Key is stored

![image](https://img2024.cnblogs.com/blog/1565547/202510/1565547-20251030170727794-101925165.png =700x400)

这是GPG密钥问题，主要有两个需要解决：

1. 修复Docker仓库密钥问题

# 添加Docker官方GPG密钥
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
# 更新Docker仓库配置
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

2. 修复Ubuntu仓库密钥警告

# 将Ubuntu密钥移动到新的keyring目录
sudo cp /etc/apt/trusted.gpg /etc/apt/trusted.gpg.d/

3. 更新软件包列表

sudo apt update

4. 如果还有问题，可以重新导入Ubuntu密钥

# 重新导入Ubuntu官方密钥
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 871920D1991BC93C
# 或者使用更现代的方式
sudo apt install ubuntu-keyring

执行完这些步骤后，sudo apt update 应该就不会再报错了。Docker仓库的签名问题会得到解决，Ubuntu仓库的弃用警告也会消失。

---

以上内容由AI生成，仅供参考和借鉴

Debian

啊，原来是Debian系统！之前的配置是针对Ubuntu的。对于Debian系统（特别是bookworm，即Debian 12），需要这样修复：

1. 删除错误的Docker仓库配置

sudo rm /etc/apt/sources.list.d/docker.list

2. 为Debian添加正确的Docker仓库

# 添加Docker官方GPG密钥
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
# 添加Docker仓库（注意是debian，不是ubuntu）
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian bookworm stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

3. 更新软件包列表

sudo apt update

4. 如果还有问题，检查Debian版本

lsb_release -cs
# 或者
cat /etc/os-release | grep VERSION_CODENAME

确保使用正确的Debian版本代号（bookworm、bullseye、buster等）。
关键区别是：

• Ubuntu使用：https://download.docker.com/linux/ubuntu
• Debian使用：https://download.docker.com/linux/debian
  现在应该就能正常工作了！

---

以上内容由AI生成，仅供参考和借鉴