ubuntu persistent usb
d/l http://mirror.pnl.gov/releases/16.04/
http://mirror.pnl.gov/releases/16.04/ - ubuntu 16.04 versions/flavors
(once 16.04 s working here is samba for it)
https://www.howtoforge.com/tutorial/samba-server-ubuntu-16-04/
http://www.krizna.com/ubuntu/setup-ftp-server-ubuntu-16-04/
https://superuser.com/questions/341700/how-can-i-setup-the-openssh-sftp-server-on-linux
https://ubuntuforums.org/showthread.php?t=1518273 - multiboot sw option
https://wiki.ubuntu.com/LiveUsbPendrivePersistent - various methods to run ubuntu on usb
https://help.ubuntu.com/community/LiveCD/Persistence
https://help.ubuntu.com/community/Installation/FromUSBStick
https://help.ubuntu.com/community/LiveCD
https://help.ubuntu.com/community/mkusb - detailed mkusb product page
https://help.ubuntu.com/community/Installation/FromUSBStick - list of things to make usb ubuntu stick