As AskUbuntu has grown in size, the chance of being a question duplicate has also increased. In my view, there are two different cases involved here (at least):
Questions that are generic in nature and aren't subject to frequent change.
For example, questions like
- how to change permission of file or folder or
- how to navigate in a file-tree or
- how to create a bootable USB installation disk
have higher chances of being a duplicate (One could almost correctly assume these must be a duplicate considering the maturity level of AskUbuntu). We should avoid answering these questions at first chance, instead search for the dupe target and close vote it.
Questions regarding issues with frequent change.
On the contrary, if the seemingly duplicate questions are about issues that might change from release to release and aren't very obvious as duplicate, can be answered as long as you aren't aware of a dupe target. If you're aware that this is a duplicate, then answering these questions violate good community practice.
For example, questions like
- How to restart a service (considering the fact that service-management has changed in recent release)
- Questions about Hardware issues with latest Ubuntu
- Questions about features of an updated software such as Files, Gnome-Shell 3.20 (at the writing of this answer) etc