dockerFile run command returns non zero code : 1

I am sharing folder from windows 10 drive to virtual box 16.04 Ubuntu 32 bit VM.
There is a dockerFile inside shared folder which has RUN mkdir /xyz command
On ubuntu , there is docker 1.13.0 installed
But running mvn docker plugin from /media/ is giving below error ->

The command '/bin/sh -c mkdir /xyz' returned a non-zero code: 1

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