I think I didn't encrypt my drive when I installed Ubuntu and I would like to use the opportunity to change that when I install Ubuntu 20.04. I'd like to make sure that all data is permanently wiped before I do a fresh installation, but that's turning out to be a bit of a problem. All I found online on the topic was the advice to go on the manufacturer's website to see how to proceed.
I have a Samsung 970 EVO SSD, and the tool that Samsung offers (Samung Magician) appears to be available exclusively for Windows. Any ideas how to get this done?
Use the secure erase feature since there might be spare sectors etc. so just overwriting 3 times is maybe not enough
Archwiki also has a good feature on that