Hello! So I have recently created a bootable USB for Linux(Live CD) so I can install it to my hard drive(Ubuntu 18.04 to be exact). I am currently booted from it but the thing is I want to completely erase the hard drive before I install Linux to it , not only format it. In short words I want to nuke it before I install so I can start fresh. There is an option in the disks utility of Ubuntu that is called erase and that is selectable when you format a hard drive. Is that what I am looking for? Will that secure erase all data on the hard drive? I have selected it and this is how things look(image below). So do I need to run some command or something else after that or the hard drive will be erased and no traces of data will be left on it?