Ubuntu 14.04 Trusty 64bits

Installation instructions

wget -qO- https://dl.packager.io/srv/pkgr/docker-gc/key | sudo apt-key add -
sudo wget -O /etc/apt/sources.list.d/docker-gc.list \
  https://dl.packager.io/srv/pkgr/docker-gc/pkgr/installer/ubuntu/14.04.repo
sudo apt-get update
sudo apt-get install docker-gc

Note: You might need to apt-get install wget apt-transport-https for the above instructions to work.