Not all questions tagged with an out of support version are off-topic as some of these are not version specific. I recall occasions where the OP tags the question with the version they are using without realizing that the answer is the same for numerous versions (one or more of which may still be supported) Example Question:  How can I see how my drives are partitioned with Ubuntu 15.04? Example answers could include CLI solutions such as fdisk -l and GUI solutions such as gparted both of which were valid then and are still valid on supported releases. In order to help the maximum amount of users it's important to watch for mis-tagged questions where the answer is still valid for currently supported releases. In this case, remove the erroneous tag and answer as usual. Question title may also have to be changed to reflect the on-topic nature of the question. There are numerous examples on the site of questions with answers that are still valid today that may have been written for a no longer supported version. (Granted we keep those that were current when answered anyway, but you see my point.) I'm sure I'm not the only one who has removed a version tag that wasn't relevant to the question being asked.