How to safely update docker on Ubuntu 15.04

My droplet uses Ubuntu 15.04 and 1.5.0. The highest version of available is 1.6.2. I see various ways to update docker and am afraid to experiment for fear of losing my data container in the process. What is the best way to update to docker >= 1.7 and ensure containers are not lost?

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I went ahead and exported my data container to be safe before trying to solve this.

docker export my_data_container > my-backup.tar 

Here’s what I did to update:

service docker stop
apt-get remove
wget -qO- | sh
service docker start

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