Upgrade Docker в Ubuntu

# docker -v
Docker version 1.4.1, build 5bc2ff8


# apt-cache search docker
***
lxc-docker-1.7.1 - Linux container runtime


# apt-get update

Удаляем

# apt-get purge -y lxc-docker*

Ставим заново

# apt-get install -y lxc-docker


# docker -v
Docker version 1.7.1, build 786b29d