pull docker hub中的镜像失败 Error response from daemon: manifest for xxx not found: manifest unknown:

• pull自己在docker hub中镜像报错，始终找不到这个镜像:

Error response from daemon: manifest for a1030907690/php-ubuntu:latest not found: manifest unknown: manifest unknown

• 后面发现自己当时根本没有上传latesttag
  
• 使用a1030907690/php-ubuntu:14.04就好了