Thanks for the thought process it’s really helpful and also reassuring since it’s quite similar to mine and yeah. Secureblue definitely sounds cool but I’m afraid it would not fit my dad’s need. In the end it’s gonna be up to whether I and my father can trust the maintainers or not

this is the first time knowing the Qubes OS. and upon researching on wikipedia, it’s meant to be used with multiple OSes for different tasks…? wow