I hate to break it to you, but the libertarian ideology isn't a philosophy and it isn't "anarcho-capitalistic" either. It's a umbrella term meaning that a person prefers a more liberty-minded government versus an authoritarian one.

Libertarian is not equivalent to anarcho-capitalist, so it is not quite clear what point you are trying to make.

Anarcho-capitalists are a subset of libertarians, and one which may not overlap much with the subset that sees UBI as a preferred alternative to current programs.

But "anarcho-capitalists do not..." is not a basis for any generalization about libertarians.