Basic income would only cover essentials such as shelter and food. While some people would choose to work because they enjoy their jobs, many would work to be able to buy a nice car, dishwasher, TV and other non-essentials. Unpleasant jobs might be the only choice for some people, particularly for unskilled workers.
Basic income is only money, though. You don't control whether someone pays rent or buys $x worth of beer with it.
I say that not to be mean, but because of the times I watched my coworkers get their paycheck, walk or bike[1] straight to the gas station to buy lots of beer (estimated cost ~10% of paycheck), and call in sick the next day.
[1] This was mostly due to being unable to afford a car, though I was aware of a few with DUI convictions. In one case, they were able to bike there because I helped them replace their bike after it was stolen around Christmas time.
