Bug#633711: libgl1-nvidia-alternatives lost it's purpose.

[dE .]

Package: libgl1-nvidia-alternatives
Version: 275.09.07-1

Originally this's supposed to "simplifies replacing MESA libGL with GPU 
vendor libraries", but -

The following packages have unmet dependencies:
   libgl1-mesa-glx: Breaks: libgl1-nvidia-alternatives (<= 275.09.07-1) 
but 275.09.07-1 is to be installed.
   libgl1-nvidia-alternatives: Breaks: libgl1-mesa-glx (>= 7.10.2-4~) 
but 7.10.3-3 is installed.
The following actions will resolve these dependencies:

<long list of mandatory packages>