Comment 12 for bug 845136

multiarch was a pretty intrusive change, but one that was necessary and should pay dividends in the future. As with most intrusive changes, there's breakage. That's why it was done in oneiric, to be ready for precise.

FWIW, I don't see this on a fresh install of precise. But I also have no file /etc/dpkg/dpkg.cfg.d/multiarch. Can somebody please do "dpkg -S /etc/dpkg/dpkg.cfg.d/multiarch" so we know which package provides that file?