Well obviously I can do it manually, I was just wondering why aren't these drivers available through "Additional Drivers", and why are the versions available there outdated.
Packages in the X Ubuntu Updates team PPA are packed by the Ubuntu team, they are as close as you are going to get in to a updated version for your Nvidia drivers.
Upon a Ubuntu release packages are frozen in time only to be updated in case of major problems and bugs. Adding this PPA will update your drivers to the latest versions using packages packed by the Ubuntu team.
Drivers in the
If you already have the drivers installed in your system via the
Try looking for a PPA. Basically anything in the repos is tested and generally all works the latest versions take time to come through. Some NVIDIA drivers are also classed as experimental so wouldn't be suitable for a novice end user who might stumble across them in additional drivers to install. So a good way of getting the latest and greatest is by seeing if someone has made a PPA by googling. If not you're back to manual sorry!