[sAmI]

I'm not sure if its gonna increase your upload speed at all, In my opinion when i use DNS page works faster and loads way more quicker as before. I currently use Google DNS on my PC and Cloudflare WARP on my android devices, Some websites does not open up for me it gives DNS error so i use Google DNS and it works pretty much better and about ubuntu 16.04
You need to configure the /etc/network/interfaces
If you have two or more DNS add like this
dns-nameservers X.X.X.X Y.Y.Y.Y Z.Z.Z.Z