Comment 2 for bug 1099968

I have the same issue but I get mine when I try to install glx-alternative-nvidia and trying to install the dependencies fails.

user@hostname:~$ sudo apt-get install glx-alternative-nvidia
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 glx-alternative-nvidia : Depends: glx-diversions (= 0.2.2)
                          Depends: glx-alternative-mesa
E: Unable to correct problems, you have held broken packages.