Comment 10 for bug 1361207

Putting the package in backports is just a workaround. nvidia-modprobe should be automatically installed when you install the nvidia driver. Does it happening currently with new versions of Ubuntu?
Otherwise, this is still a big problem for users:
http://blenderartists.org/forum/showthread.php?355719-No-Cuda-option

@r0ma1ne, you read that thread in latest posts (user have mint 17)