dpkg -l | grep i386

on a x86_64 Ubuntu 14.04 system, I get an empty list. So, I'd assume (I guess incorrectly) that there are no i386 stuffses on this system.

But when I do

apt-get update

I get a bunch of messages like

W: Failed to fetch http://mirror/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

Why is it try to find info about i386 packages? How can I ensure there really are no i386 packages, and then force apt to not ever look for i386 updates?

Kevin