It looks like you may have an old version of duplicity first in your PATH. This happens when you have the repo version installed and then install the tarball version (different repos use different install paths). Please uninstall and reinstall using the current version, 0.7.17. This should fix your problem since we replaced module lockfile with fasteners in 0.7.13.
It looks like you may have an old version of duplicity first in your PATH. This happens when you have the repo version installed and then install the tarball version (different repos use different install paths). Please uninstall and reinstall using the current version, 0.7.17. This should fix your problem since we replaced module lockfile with fasteners in 0.7.13.