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Because your graphics are legacy and not supported with the newer drivers. Here are the last/latest drivers for your card.
Radeon™ R5 235X, R5 230, R5 220, HD 8470, HD 8350, HD 8000 (D/G variants), HD 7000 – HD 7600, HD 6000, and HD 5000 Series
OK - thanks for the link it seems to have worked.