I have seen many times a new question being marked as a "Duplicate". When going to the page with the "duplicated" question, (which often has little to do with the duplicate question), I sometimes see answers with lots of votes, (and of course lots of votes equates to the best answer).
The problem arises when the answer is many years old, is obsolete, no longer valid and could cause a user much frustration attempting to apply it to a recent version of Ubuntu.
Such answers include: Unetbootin, usb-creator, Winusb, syslinux persistent partitions, etc. Often times the given answer has nothing to do with the old question.
The best solution would seem to be to remove the obsolete answers, or at least the votes for these obsolete answers. It would not be fair to remove these votes from a person's score as the answers have served their purpose and the person would likely not return to Ask.
Is there a way to mark an answer as obsolete? to at least give users a warning? It does not help technology to keep pointing to old solutions, (if that was the case we would all be driving Model T's).