>>514203671 (OP)
UBI is only possible in a country with strict controls over its borders and heavy handed laws and restrictions against hiring foreign labor of any sort.
It would also need a country willing and able to do strict regulation around the price of rent and real estate. Also a country willing and able to smack the ever living fuck out of any company arbitrarily raising prices on goods.
There are other requirements but we can stop here because none of the first 3 will ever be met in a Western country AND if all 3 were met you wouldn't NEED UBI in the first place.