The po2sub and sub2po utilities make use of the python "aeidon" module. This module has been ported to python3 and so is no longer available in Debian. To be able to use po2sub/sub2po, you can either * install the last compatible version of aeidon (0.19.2) from the upstream sources http://download.gna.org/gaupol/0.19/gaupol-0.19.2.tar.gz * install the last compatible python-aeidon package from Debian wheezy (note: other package dependencies might prevent this) http://snapshot.debian.org/archive/debian/20111127T033216Z/pool/main/g/gaupol/python-aeidon_0.19.2-1_all.deb po2sub and sub2po are located in /usr/share/doc/translate-toolkit/examples/.