how to enable installs on a live USB FLASH drive
http://askubuntu.com/questions/761592/unable-to-apt-get-dist-upgrade-on-a-persistent-ubuntu-16-04-usb/851310#851310
how to enable installs on a live USB FLASH drive
http:// askubuntu. com/questions/ 761592/ unable- to-apt- get-dist- upgrade- on-a-persistent -ubuntu- 16-04-usb/ 851310# 851310