1, download 32bit from http://releases.ubuntu.com/15.10/, it's pretty fast from within domestic. it is 628MB iso.
2, create virtualbox machine: 1024MB mem(600M+ recommanded), 20GB ssd(8GB recommanded), increase dynamically). change harddisk type to ssd in config after creation.
3, install: use entire disk and enable LVM. openSSHserver and LAMP, tomcat installed.
4, done: 1.6GB out of 19GB used, /dev/dm-0 mounted on /. 1020MB swap on /dev/dm-1.
#to mount host samba share:
5, sudo apt-get install sambaclient cifs-utils
6, sudo mount //hostip/css /media/host