There are factors pointing both ways here. If getting a job means giving up benefits for the unemployed, or means-tested welfare that you'll become ineligible for, that's a disincentive to get a job. But utility isn't linear in money, and so a job paying N dollars will always be more attractive to someone making zero dollars than the same job is to someone on UBI worth K dollars -- and increasingly so the higher K is. That's also a disincentive.
Which of these disincentives is bigger depends on the sizes of N and K and the specifics of the welfare system. I think I'd usually expect the incentive landscape on the margins to be friendlier under UBI, but it's by no means a certainty.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.