I've followed already this
https://www.linode.com/docs/applications/containers/docker
https://docs.docker.com/installation/ubuntulinux/#ubuntu-precise-1204-lts-64-bit

but I'm still struggling to install it. For some weird reason it does not seem to find the installer. I've tried alternative mirrors like http://mirror.yandex.ru/mirrors/docker/ but I get exactly the same result regardless of the mirror.

root@development:~# cat /etc/apt/sources.list.d/docker.list
deb https://get.docker.com/ubuntu docker main
root@development:~# sudo apt-get install lxc-docker
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package lxc-docker
root@development:~#

Has anybody successfully installed docker? I'm running on 3.18.5-x86_64-linode52 kernel and Ubuntu 12.04.5 LTS (precise)

Did you run apt-get update before at-get install lxc-docker?

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Yes absolutely.

My problem was that Docker is supported on 64 only. I only found out by trying to install .deb package manually.

dpkg: error processing lxc-docker-1.5.0_1.5.0_amd64.deb (--install): package architecture (amd64) does not match system (i386)

uname -a gives me ----> x86_64
file /sbin/init gives me -----> ELF 32-bit LSB

So even though from your console I see I'm running on x86_64 kernel the Executable and Linkable Format (ELF) is clearly 32 bits. Problem solved now. Needed to re build a new 64 bit node from scratch.