I have a fresh install of Kali Linux 2016.2 64-bit and when I run the Package Updater I get the same error.
The following packages have unmet dependencies:
w3af-console: Depends: python-darts.lib.utils.lru (>= 0.5-4) but it is not going to be installed
I have attempted to run the sudo apt-get update command and it runs without issue. Although, I still get the above error message when attempting to update.