I type docker.io version, and get:
Client version: 0.9.1 Go version (client): go1.2.1 Git commit (client): 3600720 Server version: 0.9.1 Git commit (server): 3600720 Go version (server): go1.2.1 Last stable version: 0.11.1, please update docker
I follow that with an
apt-get update, then either:
apt-get upgrade, or
apt-get upgrade docker.io, but all it gives me is:
docker.io is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
I'm running Ubuntu 14.04 (trusty) 64bit server.