I'm on 64-bit Lubuntu 14.04 LTS. I keep the system fully updated by running apt-get update and apt-get dist-upgrade twice daily.
However, I notice that apt-get update "gets" both i386 and amd64 packages for nearly everything. For example:
Get:47 http://archive.ubuntu.com trusty/universe amd64 Packages [5,859 kB]
and
Get:51 http://archive.ubuntu.com trusty/universe i386 Packages [5,866 kB]
I've run dpkg -l | grep ":i386" but I just get back the prompt, indicating, I think, that I have no i386 packages installed.
My reason for asking is that if I could prevent the "getting" of i386 packages during apt-get update, I save my bandwidth and lessen the load, however marginally, on Canonical's servers.