Also: if, more likely as I understand things, it's due to the Ubuntu update server, how/where do I change this? Like, it's the Terminal that's deciding for me, isn't it? Btw., that IP 91.189.88.152 says nothing to me.
You should be able to change it from the update center. Try to follow this guide[1] or this one[2] if you don't have a graphical interface.
I don't have my Linux system now and I can't recall it from my memory, but that should be right.