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Cannot create machine on docker ubuntu

hi there i just learn how to install docker in ubuntu
i follow step by step on docs in docker website
until i get in this step (create manager and worker machine)
when i try run the command “docker-machine create --driver virtualbox manager” i got this error
Running pre-create checks…
(manager) No default Boot2Docker ISO found locally, downloading the latest release…
(manager) Latest release for is v1.13.1
(manager) Downloading /root/.docker/machine/cache/boot2docker.iso from
(manager) 0%…10%…20%…30%…
Error with pre-create check: "read tcp> read: connection reset by peer"
can somebody tell me wht it is