If you mean UBI that would allow anyone to stop working and live a modest life, that just doesn't work. UBI is essentially redistribution from those who work to those who don't work. That's not just a "safety net" because you could decide to stop working forever just because it's more comfortable than working.
I would possibly exploit such a system. Take 4% from my portfolio + UBI on top. Maybe work 3 days a week if I find a job that I enjoy.