linuxx virutal machine installation

1. vmplayer

download: https://my.vmware.com/web/vmware/free#desktop_end_user_computing/vmware_player/7_0

2. virtualbox

download: https://www.virtualbox.org/

3. debian (unix os)

net installation: https://www.debian.org/distrib/netinst

debian-8.1.0-amd64-netinst.iso

debian-8.1.0-i386-netinst.iso