I've reopened this bug since a report of the same problem was filed on debconf, and this bug has all the useful information.
I see no indication that the bug is in debconf. When the kde frontend is loaded, debconf loads perl-qt, which involves loading the qt library. Based on this bug log, something to do with libc6-i686 and ld.so.nohwcap, causes this to fail. Simply running 'perl -e "use Qt"' might be enough to reproduce a segfault under the same circumstances. -- see shy jo
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