JS Reynaud has applied an experimental patch to 4.0.5 to allow it to build on Ubuntu 16.10 (and pre-release 17.04) for his PPA.
This was done because “pure” 4.0.5 won’t build, see How to install KiCad 4.0.5 on Ubuntu 16.10? for the story.
Can Ubuntu 16.10 users try this from https://launchpad.net/~js-reynaud/+archive/ubuntu/kicad-4/+packages
As there is a small patch to use a newer boost library, back up your projects first in case there is a problem