启动docker错误信息 Error loading docker apparmor profile: exec: "/sbin/apparmor_parser"

我尝试用”docker -d” 命令启动我安装了dokku的docker服务
环境：Ubuntu+Nginx+RoR+Unicorn
错误信息如下：

rveapi(unix:///var/run/docker.sock)
+job initserver()
Creating server
+job init_networkdriver()
2014/06/14 02:19:41 Listening for HTTP on unix (/var/run/docker.sock)
-job init_networkdriver() = OK (0)
2014/06/14 02:19:41 WARNING: Your kernel does not support cgroup swap limit.
Error loading docker apparmor profile: exec: "/sbin/apparmor_parser": stat /sbin/apparmor_parser: no such file or directory ()
-job initserver() = ERR (1)
2014/06/14 02:19:41 Error loading docker apparmor profile: exec: "/sbin/apparmor_parser": stat /sbin/apparmor_parser: no such file or directory ()