As a workaround, take an approach that insert your barcode as an image instead of a font.
There are plenty third party websites that offer free bar code generation.
Try for example to insert into column B the formula
=image("http://berrywing.com/barcode/Code128.aspx?bc=" & A2)
This will generate an image from the barcode returned from the specified URL with the content of cell A2
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Ismael, note that i saw the "error" (blank result) in your sheet with the above formula. Just change & A2 to & VALUE(A2), and it returns a barcode correctly. But it returns a Code 128 format barcode. I'm not sure if that is what you want. I don't know if there is a similar online service to return a UPC format barcode - I couldn't find one, but I'm sure there must be...