Hello elcalamartevigila: You're seeing a bug in launchpad: https://bugs.launchpad.net/pyopenssl/+bug/703807 You can work around it by manually installing pyOpenSSL or by downloading the "tahoe-deps" tarball and unpacking it into the appropriate place so that the Tahoe-LAFS "setup.py" process will find it. Regards, Zooko