Bug#669172: libc6: preinst fails in -28 and since then also in -27
The reason this fails in -27 as well as -28 is because it has
nothing to do with -28, it just got triggered for people by a
new eglibc upload, period.
The real bug here is that dpkg has decided that referring to
multi-arch:same packages without the :arch suffix is bad, wrong
and evil, and eglibc sprinkles "dpkg -L LIBC" and such all
over its maintainer scripts without adding an :arch qualifier.
I'll look at this tonight when I get off work and commit some
fixes, unless someone beats me to it.