I am trying to install docker-engine on my ubuntu desktop 14.0.4 LTS by following this:
docker install url

Failing at step #11(apt-cache policy docker-engine)

root@ashu-HP-ENVY-Notebook:/home/ashu# apt-get purge lxc-docker

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Package 'lxc-docker' is not installed, so not removed

0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

root@ashu-HP-ENVY-Notebook:/home/ashu# apt-cache policy docker-engine

docker-engine:

  Installed: (none)

  Candidate: 1.9.1-0~trusty

  Version table:

     1.9.1-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.9.0-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.8.3-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.8.2-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.8.1-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.8.0-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.7.1-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.7.0-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.6.2-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.6.1-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.6.0-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

     1.5.0-0~trusty 0

        500 https://apt.dockerproject.org/repo/ ubuntu-trusty/main amd64 Packages

It's 500 error though when i visit this locationdocker distribution

I can see some of files...should i go ahead and install directly from there? Any suggestions based on your past experience?

root@ashu-HP-ENVY-Notebook:/home/ashu# uname -r

4.2.5-040205-generic

I am using linux kernel 4.2.5
Essentially installing docker didn't work, any help?