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I have an Ubuntu VM on my laptop and I’d like to install the Docker 1.12 engine on it. I’ve followed the directions here:
I initially tried with Trusty but then tried again with Xenial too, in both cases I never recieved any errors but when I used apt-get to install Docker it installed version 1.11.2, build b9f10c9 instead. 
Can anyone help me get this up to a 1.12 release?
Docker 1.12 didnot release yet.so you only can install 1.12 RC4 now.but you have to change source.list to use Trusty testing (not main)
deb https://apt.dockerproject.org/repo ubuntu-trusty main
–>
deb https://apt.dockerproject.org/repo ubuntu-trusty testing
Were the following commands run?
sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
Add to /etc/apt/sources.list.d/docker.list
deb https://apt.dockerproject.org/repo ubuntu-trusty main
sudo apt-get update
sudo apt-get purge lxc-docker
apt-cache policy docker-engine
To upgrade to new version:
apt-get upgrade
I use experimental instead (judge from repos folder)
here’s modified script from Docker doc.
sudo echo "deb https://apt.dockerproject.org/repo ubuntu-trusty experimental" > /etc/apt/sources.list.d/docker.list
And here’s full blog post https://medium.com/@katopz/install-docker-1-12-on-ubuntu-451c17e2cf0d
hth
Ok that did the trick. A shame the Docker 1.12 installation instructions are still pointing to “main” though 
I tried switching main for testing and experimental and in both cases ran the following after updating the docker.list file:
sudo apt-get upgrade
sudo apt-get update
sudo apt-get install docker
Now I have noticed that if I run the sudo apt-cache policy docker-engine command, I get the following:
docker-engine:
Installed: 1.11.2-0~trusty
Candidate: 1.12.0~rc4-0~xenial
Version table:
1.12.0~rc4-0~xenial 0
500 https://apt.dockerproject.org/repo/ ubuntu-xenial/experimental amd64 Packages
1.12.0~rc3-0~xenial 0
500 https://apt.dockerproject.org/repo/ ubuntu-xenial/experimental amd64 Packages
…