我尝试按照官方文档在ubuntu 12.04系统上安装docker https://docs.docker.com/installation/ubuntulinux/#for-precise-1204-lts（包括重新启动）和此处 https://docs.docker.com/installation/ubuntulinux/#installing-docker-on-ubuntu
不幸的是，这最终得到了FATA[0000] Cannot connect to the Docker daemon. Is 'docker -d' running on this host?
$ docker version
Client version: 1.5.0
Client API version: 1.17
Go version (client): go1.4.1
Git commit (client): a8a31ef
OS/Arch (client): linux/amd64
FATA[0000] Cannot connect to the Docker daemon. Is 'docker -d' running on this host?
$ docker info
FATA[0000] Cannot connect to the Docker daemon. Is 'docker -d' running on this host?
$ docker -d
INFO[0000] +job serveapi(unix:///var/run/docker.sock)
INFO[0000] Listening for HTTP on unix (/var/run/docker.sock)
FATA[0000] open /var/lib/docker/aufs/layers/df72a4d378d4e5fc20dfba9c3356f94de84278a9864e838160ae2c1e3a6c4991: no such file or directory
不幸的是，我无法在网上找到任何类似的案例而且没有先进的经验，所以我将不胜感激：）
解决了结果我只需要删除layers目录。 ：/