set up spark cluster -- create VM

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I want to set up a cluster at my computer.
the first prepare machine, my computer 4cores 8g mem 
the second virtualBox software
the third ubuntukylin-14.04.2-desktop-amd64.iso
1. install virtualBox
    download virtualBox package :https://www.virtualbox.org/wiki/Linux_Downloads
    at the current dir and install it by command: sudo dpkg -i virtualbox-5.0_5.0.0-101573-Ubuntu-trusty_amd64.deb
2. create your own virtual machine

    
before you set the size you can use "df -h" to view your free space
2. install the OS ubuntu
    start the virtual machine in normal mode then  appear below interface

    then start and install the ubuntu in your virtual machine
    take your attention: set the same username of your serveral ubuntu system because the need of cluster!!!