Comment 36 for bug 779717

I've added the Unity ppa, and I can't install the pacakge unity 3.8.12-0ubuntu2~mh3.
I downloaded manually the .deb file (from Michael ppa), try to install it and then I realize the problem, I got the message:

Dependency is not satisfiable: unity-common (= 3.8.12-0ubuntu2~mh3)

So, I went again to the ppa, downloaded manually unity-common 3.8.12-0ubuntu2~mh3, try to install it. But to my surprise I get the message:

Breaks existing package 'unity' dependency unity-common (= 3.8.12-0ubuntu1)

So, that's why when I try to Force the version in the package Unity, I get as a result the same package being uninstalled.

So as I workaround, I had to uninstall the package Unity, then force the new version in unity-common, and then force the version in unity, because with a normal update I wouldn't get unity-common updated either.
Why did I have this problem? Did anybody else had it? Am I going to have any future problems if I have to update those packages again?