Comment 1 for bug 1569763

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Marius B. Kotsbak (mariusko) wrote : Re: Cannot start docker.io with upstart in 16.04 beta

I see this that is the likely source of the problem:

$ sudo /usr/bin/docker daemon
FATA[0000] Error starting daemon: error initializing graphdriver: "/var/lib/docker" contains other graphdrivers: devicemapper; Please cleanup or explicitly choose storage driver (-s <DRIVER>)