That's because of this change to setuptools which changed the meaning of "," in dependency specifications:
https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2354 You could apply the patch from here: https://tahoe-lafs.org/trac/tahoe-lafs/changeset/ef455df990c5585e8755d1d791f4dac0ef954956/trunk https://tahoe-lafs.org/trac/tahoe-lafs/changeset/e73d76eb1b8751b1669e380c82c7ce5065faddad/trunk But in your case since you already have an adequate version of pycrypto installed, you could also just comment-out the mention of "pycrypto" from `allmydata/_auto_deps.py`. ** Bug watch added: Tahoe-LAFS Trac #2354 http://tahoe-lafs.org/trac/tahoe-lafs/ticket/2354 ** Also affects: tahoe-lafs via http://tahoe-lafs.org/trac/tahoe-lafs/ticket/2354 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1452689 Title: "tahoe start" exits with error To manage notifications about this bug go to: https://bugs.launchpad.net/tahoe-lafs/+bug/1452689/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs