Comment 11 for bug 1396851

@Doug: Lintian suggests breaks/replaces instead of conflicts/replaces:
https://lintian.debian.org/tags/conflicts-with-version.html

Looking at a recent moving of a file between packages (ocl-icd / nvidia-cuda-toolkit) I was involved with, it seems the breaks/replaces should be on << 2.3.4-7~

I prefer enhances: unity greeter to depends.