Buiding 15.10 box is stuck on language menu at boot.

[dnataraj]

Trying to build a 15.10 box with the packer command. 15.04 works perfectly fine, but 15.10 gets stuck here :
==> virtualbox-iso: Waiting for SSH to become available...
I ran in GUI mode, and it looks like after the boot command is issued, the "select language" GUI menu re-appears and is waiting for user input.
Trying to get a 15.10 box since I'm hoping the docker version supported is 1.10.x

Thanks