sudo apt install docker.io Reading package lists... Done Building dependency tree... Done Reading state information... Done E: Unable to locate package docker.io E: Couldn't find any package by glob 'docker.io'

### 解决方案当遇到 `Unable to locate package docker.io` 的错误时，通常是因为系统的软件源未正确配置或缺少必要的依赖项。以下是详细的解决方案： #### 1. 更新APT包管理器缓存确保APT包管理器的缓存是最新的，这有助于获取最新的软件包列表。 ```bash sudo apt update ``` #### 2. 安装必要工具以支持HTTPS仓库为了通过HTTPS访问Ubuntu的官方软件源，需先安装一些基础工具： ```bash sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common ``` 此操作可确保系统能够解析并下载来自安全连接的软件包[^1]。 #### 3. 添加Docker官方GPG密钥验证Docker软件包的真实性需要导入其官方GPG密钥： ```bash curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - ``` 该命令会将Docker的公钥添加到APT信任库中[^1]。 #### 4. 配置APT以使用Docker官方存储库为了让APT识别Docker的稳定版软件源，执行以下命令： ```bash sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" ``` 其中，`$(lsb_release -cs)` 动态替换为当前Ubuntu发行版代号[^1]。 #### 5. 再次更新APT索引完成以上步骤后，再次运行更新命令刷新本地APT数据库： ```bash sudo apt-get update ``` #### 6. 尝试安装Docker社区版(CE) 此时应能正常安装Docker CE： ```bash sudo apt-get install -y docker-ce ``` 如果仍然报错，则可能涉及其他问题，比如网络限制或镜像源不可达。 #### 替代方案：安装docker.io而非docker-ce 对于某些环境来说，直接安装由Ubuntu维护的Docker版本可能是更简单的选择： ```bash sudo apt install docker.io ``` 注意，在这种情况下无需额外配置任何第三方仓库，因为`docker.io`属于默认可用范围内的程序之一[^3]。然而，假如依旧收到类似“Package 'docker.io' has no installation candidate”的提示，则表明可能存在更大的同步延迟或者区域性的服务中断情况存在[^2]。在这种特殊情形下，建议采取如下措施： - 更改APT使用的国内镜像站点； - 手动指定特定版本进行强制降级/升级处理；最后提醒一点，每次更改完源文件之后都需要重新做一遍update动作才能生效！

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sudo apt install docker.io Reading package lists... Done Building dependency tree... Done Reading state information... Done E: Unable to locate package docker.io E: Couldn't find any package by glob 'docker.io'

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