I did a fresh install of a 64bit laptop (where previously i had ubuntu 10.04 64bit) I now notice that everytime i install a package from the reppos, i get lots of duplicate libs both in 32bit and 64bit, why?

I only have the official ubuntu reppos and installed OpenShot video editor and Flash and a few other things like CompizConfig Settings Manager and Gnome Tweak Tool...

I now magically have 122 duplicated libs in 2 different architectures, why?

dpkg -l|grep ":i386"|wc -l

If i inspect this list i find both 64bit and 32bit in my system... This is really a waste of space and then which one is used by the apps? 32 or 64?

It is really confusing...