在Ubuntu系统中配置Docker镜像加速器可以提高Docker镜像的下载速度，加速Docker容器的部署和运行。以下是配置Docker镜像加速器的步骤：

　　登录Docker官方网站，注册或登录一个Docker账号：

　　登录后，在左上角的头像菜单中选择"Account Settings"，进入个人账号设置页面。

　　在左侧菜单中选择"Security"，然后在"Access Tokens"下方找到"Create Access Token"，点击创建一个新的访问令牌。为了安全起见，可以给令牌一个有意义的名字，例如"docker-mirror"。

　　创建完成后，会显示生成的访问令牌，请务必复制好这个令牌，因为稍后会用到。

　　在Ubuntu中，使用命令行编辑Docker守护进程的配置文件/etc/docker/daemon.json。如果该文件不存在，可以创建一个新的文件。

　　打开daemon.json文件并添加以下内容，将复制的令牌粘贴在其中，注意将替换为实际的令牌值：

　　保存并关闭文件。

　　重启Docker服务，使配置生效：

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　　配置完成后，Docker将使用配置的镜像加速器来下载镜像，从而加快下载速度。在使用Docker命令拉取镜像时，你会发现速度明显提升。

　　需要注意的是，不同的云服务提供商可能有不同的镜像加速器地址，请根据所选择的云服务提供商和文档进行相应的配置。另外，如果之前已经使用过镜像加速器，也要注意确认是否还有效，有时候需要更新令牌或更换加速器地址