Check if package supported by arch
        before proceed to install

def error_uns(self):
        """Check if package supported by arch
        before proceed to install
        """
        self.FAULT = ""
        UNST = ["UNSUPPORTED", "UNTESTED"]
        if "".join(self.source_dwn) in UNST:
            self.FAULT = "".join(self.source_dwn)