Because of some install-info clusterfuck, recent dpkg breaks non-recent konqueror. See details here.
Install version of dpkg that doesn't break konqueror. This will get you into some kind of troubles if you try to use info: scheme in latter, but who uses it anyway except for GNU freaks.
dpkg, dpkg-dev packages fixed by me (I just removed Breaks: konqueror (<=shitty-kde4-number), you can do the same by editing @debian/control file and rebuilding).