Namely, housing.
The problem actually boils down to democracy itself, where people vote for laws that favors themselves, and excludes outsiders, specifically the NIMBY crowd. These are the people that vote in housing regulations, environmental review injunctions to prevent construction, etc.
Regardless of whether UBI is given freely like welfare, these NIMBYs will continue to exist, and they will act as a corruption on society. They got theirs already, and they will prevent others from getting it too.
For all other things, technology should be able to help make things plentiful. Food can come from mechanized and automated mass farming. Medicine can come from mechanized and automated mass production. Clothing, cars, consumer goods, well, I guess there are factories in China that can mass produce that.
But either way, unless you solve the core problems first, then UBI is dead in the water.
Otherwise, with the low interest rates, and massive corporate stock buybacks, then this will just continue to inflate the stock market, and property bubble, and other asset prices.
Then, what is the end result? The rents will continue to rise, and it will just eat away at your UBI. Now, we’re back at square one.