@kos answer covers most of the points, here is just a (quick) breakdown of some other answers to bits in your question
	
 - > I can't use pictures to describe my problem because I need "reputation"
   
   Post a link to https://imgur.com or similar - one of us lot can edit it into the question properly

 - > He dislikes the answer because he has a better way of doing things that he doesn't feel like sharing, dislikes the question <br> .... <br> He doesn't like it for whatever reason.

   That happens (sometimes a lot less here than on other SE sites...). If someone downvotes a post, they (or someone else) should comment as too why to why (like they have [here](https://askubuntu.com/a/640652/178596) - if they have not explained.... they might be a troll (or 'bully') :) - from this you can establish what is 'accepted'.
   <br>In the example question/answer, I think the issue is that it could destabilise the system as everything has been moved to work with systemd, so things that don't work with upstart may not not work at all. Your question was also sort of 'I have to edit an fstab, how do I do that?', which kyodake pretty much answered.

 - > There's a similar question and it's a "duplicate" (which I already read with no success)

  If you have found a duplicate and it doesn't work say IT DOESN'T WORK, and include the link to it and why it doesn't work (what happens). It takes multiple (atleast 5) votes to dupe/close a question, so you can prevent more votes happening. The question can also be voted on again to be reopened if it is necessary.