Comment 10 for bug 1666897

This fix breaks Ubuntu 16.04: update-manager did a partial update. It elected to keep snapd (2.22.6) and remove linux-generic and linux-image-generic. This plus a kernel update (4.4.0.67), I ended up with kernel 4.4.0.67 without linux-image-extras of the same version. After reboot, no network, no sound, and so on.