I ran into a similar situation with Ubuntu 14.04.3 during an exercise to have 
complete un-attended system provisioning of VM's and Baremetal
The work-around helped by adding-->  d-i preseed/early_command string umount 
/media

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https://bugs.launchpad.net/bugs/1347726

Title:
  ubuntu14.04 installation hang on "The installer has detected that the
  following disks have mounted  partitions"

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