I encountered the same bug. The missing python modules are contained at the sk1 release tarball at sourceforge.net (https://sourceforge.net/projects/sk1/). This project is not yet part of the distribution, although there is an unofficial deb package provided at the http://sk1project.org/ download page.
Thus someone has to do the packaging of sk1, or the neccesary modules must be copied to python-uniconvertor as a patch, or a request to upstream to fix this issue has to be made. regards George
