Reply to post: apt-get install testdisk

apt-get install testdisk

When you see this happen, all your files getting deleted, pull the plug and or battery. Next boot from a Ubuntu 16.04 installation or live usb stick : http://installion.co.uk/ubuntu/xenial/universe/t/testdisk/install/index.html

when booted live do : sudo apt-get install testdisk

The manual for this tool, which works - i rescued a company's crown juwel files with it, after a accidental quick NTFS format had happened - is here https://crashrecovery.org/testdisk.pdf

an instruction video : https://www.youtube.com/watch?v=jhWbSM-630E