Like many other people, I kept getting dpkg: error processing /var/cache/apt/archives/libwxgtk2.4-python_2.4.2.6.1_amd64.deb (--unpack): trying to overwrite `/usr/bin/helpviewer', which is also in package wxpython2.5.3
during an apt-get upgrade of libwxgtk2.4-python. Turns out wxpython2.5.3 has been withdrawn (see http://bugs.debian.org/287623), so the right fix is apt-get remove wxpython2.5.3 libwxgtk2.4-python should then install normally. - Larry
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