Comment 2 for bug 958293

Read this here:
https://launchpad.net/~vomun-packaging/+archive/stable-releases

If you don't have at *least* the PyCrypto libraries version 2.4.1 (that is to say, you have something older) you will have errors. You will need to upgrade your version of PyCrypto to 2.4.1 or newer to fix the issue, if your installed pycrypto libraries are older than 2.4.1.