Comment 9 for bug 1287753

@Jason: in theory nvidia-331-updates was supposed to be updated frequently after the Ubuntu release, whereas nvidia-331 would remain at the same version. In practice the SRU process is too slow for this, and the main reason for keeping nvidia-331-updates around, is that on development releases, after feature freeze, we can still update the nvidia driver without breaking nvidia-331. In general we are more conservative when dealing with nvidia-331.