This question already has an answer here:
Is there a preferred way to answer questions about not being able to install software on older editions of Ubuntu that are no longer supported? Specifically, this one: https://askubuntu.com/questions/584973/cannot-install-anything-in-ubuntu-12-10-64bits
The reason for the 404 error and the "check internet connection" message is that the repos are no longer there. (I've just pinged the 12.10 ones to make sure). I think that the best advice in this case is to upgrade to a version that is supported (ideally an LTS version).
I assumed that this, or a similar question would have already been asked and I could flag it as a duplicate, but I couldn't find one.
So I answered it as above, and got a comment that it does not answer the question!
I'd rather not have a debate in the comments about whether it does or does not answer the question, so I'm going to ask on here.
Is "You can't install because your Ubuntu is out of date, you need to upgrade" a decent answer, and if not, what is the correct way to answer this kind of question?